eChapters

Abstract: Viola or garden pansy, commonly known as sweet violet or king of annuals, are widely cultivated worldwide for landscape planting, garden design and container gardening. Today, numerous OP varieties, F₁ hybrids (Europa, Toto, Wasa), F₂ strains, series (Waterford, heat tolerant S series) and cultivars introduced by seed companies are available on the world market. Pansy breeding efforts have been focused on F₁ hybrid seed production, heat tolerance, flower colour, flower size and form, double flowers, earliness, disease resistance, floriferous nature and interspecific hybridization. Increasing knowledge of the inheritance of traits and molecular genetics techniques are valuable tools aiding modern pansy breeders. Research is needed to exploit heterosis for productivity and gene transformation to create new genetic variability.

The papaya (Carica papaya L.) belongs to the family Caricaceae. It is an important fruit of tropical and sub-tropical regions of the world. It is the most important plant in the home gardens, and where green papaya is also used as a vegetable. Ripe fruits are eaten as dessert, which is available throughout the year.

Papaya is native to West Indies and Central America (Mexico). It is a common fruit in nearly all parts of tropical and sub-tropical world. It is abundantly grown in India, Sri Lanka, Bangladesh, South America, Pakistan, Australia, Mexico, Costa Rica, Hawaii, Kenya, Taiwan, Puerto Rica, Peru, USA, Philippines. It was introduced in India in 16^th Century. In India it is mainly cultivated in Kerala, Assam, Bihar Uttar Pradesh, Gujarat, Tamil Nadu and West Bengal.

Cultivars: Honey Dew, Coorg Honey Dew, Washingtan, Pusa Delicious, Pusa Majesty, Pusa Dwarf, Pusa Giant, Co. 1 to Co. 7, Arka Surya, Arka Prabhat, Pusa Nanha, Pink Flesh Sweet, Pant 1, Sunrise Solo and Taiwan Red Lady, are the most popular varieties under cultivation in India.

Papaya is one of the fruit crops grown both commercially as well as a backyard crop. Papaya was mainly a backyard crop till recently. It emerged as a main commercial crop during the last decade, because of the high nutritive value. It is a rich source of Vitamin A (2020 I.U), Vitamin B1 (40 mg), Vitamin C (46mg), protein (0.5%) and mineral matters (0.4%). Ripe papaya is a favourite breakfast and dessert fruit available yearround. It is used for making fruit salads, refreshing drinks, jams, jelly, marmalade, candies and crystallized fruits. Green fruits are pickled or cooked as vegetable. Carpine, an alkaloid present in papaya, can be used as a heart depressant, amoebicide and diuretic. It is also grown for the extraction of papain, a proteolytic enzyme present in the latex, collected mainly from the green fruit. In 1875, T. P. Lucas, a British physician discovered the medicinal value of papaya and started a hospital in Brisbane, to treat patients solely with papaya. The people in Papua New Guinea use papaya for the skin and to treat rashes or sunburn or, with repeated applications, to remove the brown spots of aging. They also say that if you put papaya into the compost pile, they grow especially large! Natives in the Pacific Islands use all parts of the papaya tree for medicinal purposes — leaves, skin, seeds, bark, roots, flowers and of course, the fruit. South American women massage their breasts with thin slices of green papaya to stimulate the milk glands. Eating the fruit provides energy and nutrients for both herself and the baby. Papaya bark is used as a toothache remedy and the flowers in teas, to treat bronchial infections. For centuries, teas from the roots were used to expel parasites and to alleviate bleeding, kidney colic, and jaundice.

1. Stem rot / Foot rot/Collar rot
Diagnostic Symptoms
• The appearance of water-soaked spots on the stem close to ground level is what characterizes it.
• The tissues degrade as a result of the fast enlargement of these patches, girdling the stem and turning it dark brown or black.
• Strong winds cause these afflicted plants to topple over and eventually die.
• If the disease attack is not too severe, the plants will still be stunted and only one side of the stem will decay.
• If fruit develops, it is deformed and withered.
• The plant eventually dies (Fig.1).
Etiology
• Pathogen: Pythium aphanidermatum.
• Mycelium is colorless, slender, coenocytic, profusely branching and rapidly growing mostly intracellularly.
• Sporangia terminal or intercalary produce a vesicle at the end of hyphal branch.
• Zoospores biflagellate and reniform.

The papaya, papaw or pawpaw is the fruit of the plant Carica papaya, commonly known as ‘melon tree’ in the genus Carica. It is native to the tropics of the America. This highly loved tropical fruit was reputably called “The Fruit of the Angels” by Christopher Columbus. Papaya is considered powerhouse of nutrients as it is rich in anti-oxidants, vitamins viz. A, B, C, minerals like potassium and magnesium and fiber. Together, these nutrients needed for function of a healthy immune system, promote the health of the cardiovascular system and also provide protection against colon cancer. In addition, papaya contains the digestive enzyme, papain, which helps in digestion and is widely used in industry for various purposes. 

Fruit flies : Bactrocera cucurbitae,Toxotrypana curvicauda : Tephritidae

The fruit flies lay eggs on maturing fruits. The emerging maggots feed in the fruit pulp, causing rotting of the fruits.

AK grasshopper: Poekilocerus pictus: Acrididae

Nymphs and adults of the AK grass hopper feed on papaya leaves and tender bark.  Maximum damage is done during July-August in North India.
 
Aphids : Aphis gossypii, Myzus persicae: Aphididae

Nymphs and adult aphids suck sap from leaves. They are more important as a vector of papaya mosaic virus disease. The affected trees die in an year or two.

Genus : Carica 
Species : papaya L.
Family : Caricaceae
Chromosome No. : 2n = 18, 36

The papaya plant is a huge/giant herbaceous plant and in general appearance looks more like a palm although there exists no botanical relationship between them. Papaya is said to be native of tropical America where it is a common fruit however the exact place of its origin is not well determined. Presently the plant is widely distributed and is abundant in India, Sri Lanka and many other countries of the Malaya Archipelago, Hawaii. Papaya fruit as well as all plant parts contain a milky sap called papain. This enzyme resembles animal pepsin in its digestive action and has become an important article of commerce, is utilized in the clarification of beer and its digestive action too has been very well recognized. Another remarkable papaya character is the irregularity which it presents in the sex distribution. Being dioecious, staminate and pistillate flowers are produced on different plants, besides a number of intermediate form have also been observed.

Origin and history: Papaya has long been known as wonder fruit of the tropics and is one of the five major fruit crops of tropical world, papaya fruits throughout the year and a remunerative fruit crop which is grown in almost every part of the country. It gives maximum yield per unit and income next to banana. It is generally grown as fruit plant in kitchen garden, home garden or nutrition garden and later as commercial fruit. It is also planted as a filler plant in a fruit orchard. India is the second largest producer of papaya in the world after Brazil. It is a fruit native to tropical America and commercially grown in many parts of the world viz., Australia, Hawaii, Taiwan, Puerto Rico, Peru, Florida, Texas, California, South Africa, Pakistan, Bangladesh and India. In India, it was introduced by Portuguese in 1611. It is grown in Karnataka, Bihar, Kerala, Tamil Nadu, Assam, Gujarat, Maharastra, Andhra Pradesh, Madhya Pradesh etc.

Papaya (Carica papaya L.) has emerged from the status of a home garden plant to that of commercial orchards and is popular with the farmers because it is one of the few fruits which fruits throughout the year, give quick and high returns, requires less area per tree and adapts itself to diverse soil and climatic conditions. It is an important fruit of tropical and mild subtropical regions of the country. Though India is the leading producer of this fruit, the productivity (43.27 MT/ha) is below it’s potentially (100 t/ ha). In India, Andhra Pradesh, Gujarat, Karnataka, Madhya Pradesh and Maharashtra are important centres of its production.

Origin and Distribution

Papaya is native to tropical America, from Southern Mexico through the Andes of South America. It was spread to the south by Indians, and throughout the Caribbean with Spanish exploration. It was spread in 16^th century to other parts of the world. The Spanish also carried it to Europe and the Pacific Islands. By the mid 17th century, papaya was distributed pan tropically. Papaya was introduced to Hawaii in the 1800s, and Hawaii remains the only state in the USA to produce papaya commercially. Now it is grown in all tropical and sub-tropical countries like Australia, Hawaii, Taiwan, Puerto Rico, Peru, Florida, Pakistan, Bangladesh and India. It was introduced in India in 16^th century by Portuguese. There are leading producer countries in the world which are India, Brazil, Mexico, Indonesia, Dominican republic, Nigeria, Democratic republic of the congo, Cuba, Thailand and Venezuela (Bolivarian republic).

India, is the worldwide leading producer of papaya and its principal exportation market is focused on Gulf countries. The papaya cultivation in India was 138 with production 5989 (‘000 hectare production ‘000 metric tones) in 2017–18 and it was 146 with production 6096 (‘000 hectare production ‘000 metric tones) 2018–2019. At harvested area rank, Mexico is the fifth papaya harvester, with 17,500 hectares. The maximum area in Gujarat followed by Andhra Pradesh, Kerala, and Chhattisgarh; and production is maximum in Andhra Pradesh followed by Gujarat and Karnataka, Anony, 2019.

Yellow pigment in papaya - Caricaxanthin

• The enzyme present in dried latex of papaya (papain) is pepsin.
• Frost is the most limiting factor for papaya cultivation in North India.
• Papaya is a polygamous plant. –
• 20 seeds of papaya weigh one gram
• Carpine obtained from papaya is used as a diuretic and heart stimulant.
• 10% male plants are planted wherein dioecious varieties are calculated.
• Papaya plants are extremely susceptible to waterlogging.
• Papaya is thermosensitive crop.

  Carica candoamarcensis is scientific name for Mountain papaya.

• Papaya has the highest production after banana.
• Sunrise Solo type papaya produces no male plants.

Papaya, Carica papaya is a fruit mainly grown in tropical and sub-tropical regions. India is top most producer of papaya in the world and accounts for around 45 per cent of the total papaya production in the world. In India, the main cultivation of papaya is in the states of Telangana, Andhra Pradesh, Orissa, West Bengal, Kerala, Karnataka, Madhya Pradesh, Tamil Nadu and Gujarat. In north, due to frost problem, the cultivation is fruitful only in frost free areas as this fruit crop is highly frost sensitive. Few insect pests are of major concern in the cultivation of papaya, the description of which is given hereunder:

Papaya mealy bug, Paracoccus marginatus Williams & Granara de Willink (Pseudococcidae: Hemiptera)

It is an invasive pest believed to be a native of Mexico or Central America. In India, it was first reported in Tamil Nadu during July 2008 infesting papaya and later it spread to number of fruit, vegetables and ornamental crops in many states. The eggs are grain like and greenish yellow. The nymphs as well as adult is yellow but appears white due to waxy coating over its body

3.1. Introduction

Paper and paper-based packaging is the traditional form of packaging used for various food products due to its various advantageous characteristics. It is less expensive, flexible, lightweight, durable, recyclable and available in various shapes, sizes and colour to meet customer needs. Hence it occupies a vast market in food packaging from primary (i.e., packaging which is first used after manufacture) to secondary (i.e. processing aids of primary packages) packaging and the production of paper has doubled in the last three decades. In the year 2020, china was the leading producer for paper and paper based packaging followed by USA and Japan (Figure 1).

Paper chromatography (P.C.) is the easiest to perform and requires simple and ordinary apparatus. It easily provides qualitative information since components of a mixture can be separated based on their mobilities or molecular weights. It also can provide quantitative information if some special attention and calculation procedures are followed. Paper chromatography is a technique that involves placing a small dot or line of sample solution on to a strip of chromatography paper. The paper is placed in a jar containing a shallow layer of solvent and sealed. As the solvent rises through the paper, it meets the sample mixture, which starts to travel up the paper with the solvent. This paper is made of cellulose, a polar substance, and the compounds within the mixture travel farther if they are non-polar. More polar substances bond with the cellulose paper more quickly, and therefore do not travel as far.

Soils become acidic due to natural  and artificial (anthropogenic) reasons. The natural reasons include their origin from acidic parent materials namely granite, rhyolite, pegmatite and dacite etc. and areas under high rainfall  (rainfall  exceeding evapotranspiration) removing  basic cations through leaching and erosion particularly in coarse textured soils with undulated, hilly and sloping topography. Under natural condition, accumulation of organic matter and its decomposition also releases organic acids into the soil system, turning soils  acidic. The anthropogenic factors    responsible for turning soils  acidic,  are (i) removal of basic cations through crop cultivation, (ii) continuous use of acid forming fertilizers and (iii) acid rain in industrial areas.

Paphiopedilum is a genus of the orchid subfamily Cypripedioideae  and family Orchidaceae. It is derived from Paphos and ancient Greek word “pedilon” means “slipper”. Paphiopedilums are often called “slipper orchids” because of their unique pouch. The pouch traps insects seeking nectar and to leave again they have to climb up past the staminode, behind which they collect or deposit pollinia. Paphiopedilum has a highly ornamental value being the treasure of Orchidaceae. They are easily grown as houseplants and their care is very similar to African Violets.

Paphiopedilum is a genus of the orchid subfamily Cypripedioideae and family Orchidaceae. It is derived from Paphos and ancient Greek word “pedilon” means “slipper”. Paphiopedilums are often called “slipper orchids” because of their unique pouch. The pouch traps insects seeking nectar and to leave again they have to climb up past the staminode, behind which they collect or deposit pollinia. Paphiopedilum has a highly ornamental value being the treasure of Orchidaceae. They are easily grown as houseplants and their care is very similar to African Violets.

ORIGIN AND DISTRIBUTION

The genus name Paphiopedilum was established by Ernst Hugo Heinrich Pfitzer in 1886. Ironically, no paphiopedilum occurs on Cyprus- at least not as the genus is understood today. But it was long mixed up with its holarctic relative Cypripedium, which indeed grows in the Mediterranean region. Paphiopedilum was finally decided to be a valid taxon in 1959, but its use has become restricted to eastern Asian species. The genus is native to Indo-Malaysia (South China, Southeast Asia and the Pacific Islands) and India. Paphiopedilum armeniacum is found from China (west Yunnan province) to northern Myanmar. It occurs at 1,600 to 2,000 metres above sea level. It is found growing on limestone hills, in semi-shaded deciduous forest, usually on cliffs above rivers.

SPECIES

Over fifty species of Paphiopedilum have been discovered in the far east from the higher, cooler elevations of the Himalayas, across to China and Southeast Asia and down to the warmer, sea-level regions of Malaysia, Indonesia and the Philippines (Hawkes, 1965). Most species, like Paphiopedilum callosum are terrestrial in nature growing under the shaded and moist conditions of the forest floor (Fitch, 1982). Some species, such as Paphiopedilum niveum are lithophytic found in colonies on the coastal rock formations of the Malaysian islands (Fitch, 1982a). While a few of the larger strap-leaf Paphiopedilum species exposed to the higher light conditions found in their loftier habitats. Paphiopedilum philippinense var. roebelenii and Paphiopedilum lowii provide a strong contrast to such as Paph. lowii, are usually epiphytic Paphiopedilum charlesworthii previously described and serve to illustrate the extent of variation in both plant and flower habit within this genus. Unlike the single-flowered spikes of Paphiopedilum charlesworthii, which are usually around 15 cm tall, those of Paph. philippinense var. roebelenii and Paph. lowii can bear up to a half-dozen flowers and can measure 60 cm or more in length. Paphiopedilums with this kind of flowering habit are referred to as multifloral paphiopedilums (Batchelor). The plants themselves can be quite large particularly in the case of Paphiopedilum lowii, where individual leaves are often well over 30 cm long, though narrow.

9.1. Origin and distribution

• Originate from North America, in particular Central Mexico.

9.2. Economic importance

• Paprika contains capsanthin and capsorubin.

• Used to season and color rice, stews, and soups, such as goulash, and in the preparation of sausages, mixed with meats and other spices.

• There are six paprika American, Bulgarian, Hungarian, Moroccan, Spanish and Yugoslavian.

• In US, sprinkled raw on foods as a garnish.

9.3. Types and varieties

• Types of bell pepper

? Green pepper: Can be a little bitter, but it is very useful, such a fruit reduces the level of cholesterol in the blood. And it has the least calories.

? Red pepper: Is the sweetest and contains the most vitamin C.

? Orange pepper: It is also very tasty, but it contains slightly less vitamin C than red.

Introduction

Enough literature is available to understand the concept of extension. But are there any efforts to understand the in-tensions of ex-tension? Why should we emphasize on inner tensions of extension? to be a successful extension professional for bringing about the desirable changes in the behaviour of stakeholders, we need to understand the inner-tensions of extension in addition to the concept of extension.

Since inception of extension services, the model adopted for transfer of technology was dominated Technology, wherein the core emphasis was on the transfer of technology. The end product was the partial adoption of the technology or non-adoption of the technology. Learning from the experiences, modifications were made in the model and came out with extension mediated technology transfer system, wherein the technology is inseparable component of extension, which was combined with the human element or the societal element. The approaches adopted by different models of extension service delivery were also diverse.

The first model of extension service delivery the Public extension system or the Ministry of Agriculture, which delivers the extension services in the form of a systems approach. The relationship with the farmers or the end users is ‘take it or leave it’. Whether the receivers are gaining it or not, whether they do understand it or not, ultimately we are transferring it, and are ending it with the target oriented approach.

Parakeratosis is a pathological condition characterized by the abnormal keratinization of epithelial tissues. In ruminants, particularly cattle, buffaloes, sheep, and goats, parakeratosis primarily affects the rumen epithelium. This condition is often associated with dietary imbalances, particularly in animals fed high-concentrate, low-fibre diets. Left unchecked, it can lead to significant health issues, including impaired nutrient absorption, secondary infections, and reduced productivity.
The rumen is a vital component of the ruminant digestive system, serving as a fermentation chamber where microbes break down fibrous plant material into volatile fatty acids (VFAs), which are absorbed and used as energy. The rumen wall consists of four layers: the stratum basale, stratum spinosum, stratum granulosum, and stratum corneum. The stratum corneum is the outermost layer, consisting of keratinized epithelial cells that protect the underlying tissues. Under normal conditions, the keratinization of the rumen epithelium is tightly regulated. However, certain dietary and environmental factors can disrupt this process, leading to parakeratosis. Nutritional management is a cornerstone of both the prevention and treatment of parakeratosis. Proper dietary practices ensure the maintenance of a healthy rumen environment, optimal microbial activity, and the prevention of epithelial damage. The link between diet and parakeratosis is well established.

Aim: Perform the parallel operation of single-phase transformer and observe the load sharing of each transformer.

A power transformer is one of the most vital and an equally expensive component in a power system. It may so happen that, over time, due to load growth in its service area, an existing transformer may not be able to withstand the demand during peak-hours without exceeding its long-term MVA rating. Operating a transformer in such a fashion would cause overheating and degrade its expected life. In most cases, instead of commissioning an entirely new higher capacity unit, a more viable alternative exists in adding a smaller unit in parallel to complement the existing one. In other words, a new smaller capacity transformer can now be connected in parallel to the existing one such that the two shares a large peak load in a specific proportion and the one operating near limits is relieved of the burden.

Hypothesis testing enables researchers to determine whether apparent climatic or agricultural differences are statistically meaningful. Parametric tests are appropriate when data satisfy assumptions such as normality and homogeneity, whereas non-parametric tests are useful for irregular, ranked or non-normally distributed observations. This chapter discusses commonly used procedures, assumptions, selection criteria and interpretation. Applications include comparing weather conditions, evaluating crop responses, detecting rainfall or temperature trends and assessing environmental change. Methods such as t-tests, Mann-Whitney, Wilcoxon, Kruskal-Wallis and Mann-Kendall tests are relevant to agroclimatic research. Appropriate test selection improves analytical reliability and supports evidence-based decisions concerning climate variability, crop performance and agricultural adaptation.

Common characters

Modification of mandiblate mouth parts into sucking-piercing or suctorial type.

Absence of anal lobe in hind wing.

Background

The demand for development of Integrated Pest Management (IPM) strategies is increasing, since many problems have appeared with the use of synthetic pesticides and semiochemicals – informative molecules used in insect-insect or plant-insect interaction – are being considered as an alternative or complementary approach within IPM strategies. (Heuskin et al., 2011). Indeed, such communication molecules like para-pheromones do not present any related adverse effects on beneficial organisms in the ecosystem.

For fruitflies management, several eco-friendly control options  have been developed and recommended across the globe which  include trapping, safe disposal of infested fruits, repulsion with botanical products and physical covering of the developing fruits, besides area-based control through mass trapping and sterile-insect technique. Nevertheless, the use of para-pheromones-based lures in trap systems appears to have greater potential to be among the more widely adopted practices (Verghese, 2009).

WHY, WHEN AND HOW FISH GET PARASITES

Parasites pose a real risk to fishes

All fish are potential hosts to many different species of parasites. Small numbers of parasites are common and probably do little harm. However, all parasites have tremendous reproductive potential and can, under ideal conditions, quickly overwhelm fish in the confines of a tank or pond.

Types of parasites

We can broadly class parasites into two groups. Ectoparasites are found on the external surfaces such as skin, fins and gills, while endoparasites are found in the internal tissues and organs.

Endoparasites are uncommon in ornamental fish. However, there is a wide diversity of blood parasites, worms that colonize the intestines and other parasites that can invade various organs and tissues. Many require an intermediate host, such as snails, birds or the introduction of an infected fish, and so are rare in pond/ aquarium fish. There are a variety of clinical signs which might indicate the presence of endoparasites. Lethargy accompanied by emaciation is a common sign, as are worms protruding from the anus. Identification of sporozoan and protozoan endoparasites often requires microscopic examination of tissues (Chanratchakool et al. 1994).

INTRODUCTION

A parasite is an organism which exploits another organism for the purpose of staying alive. Some parasitic relationships are harmless, while in other cases a parasite can damage or even kill its host. The word is borrowed from the Greek word ‘‘parasitos’’, meaning “one who eats at the table of someone else.” In case of exotic carps parasites causes a great loss by reducing economy. Some, cannot live once their host dies, while others can continue thriving on dead hosts until their nutrients are consumed. Parasites live inside a host are called endoparasites or internal parasites. Ectoparasites live outside the host, and are generally more capable of switching hosts. A parasite preys on other parasites, is called epiparasite (Anderson, 1974).

Silver Carp

The silver carp (Hypophthalmichthys molitrix) is a species of freshwater cyprinid fish, a variety of Asian carp native to north and northeast Asia. It is cultivated in China. Pound for pound, more silver carp are produced worldwide in aquaculture than any other species. Silver carp are usually farmed in polyculture with other Asian major carps, or sometimes Indian major carps or other species. It has been introduced to, or spread into via connected waterways, at least 88 countries around the world.Introduced in india in 1959 at the pond culture division of CIFRI. In India in 1963 breed sucessfully by hypophysation. The silver carp is a filter feeder, and possesses a remarkably specialized filtration apparatus capable of filtering particles as small as 4 µm. The gill rakers are fused into a sponge-like filter, and an epibranchial organ secretes mucus which assists in trapping small particles. A strong buccal pump forces water through this filter. Silver carp, like all Hypophthalmichthys species, have no stomachs; they are thought to feed more or less constantly. Silver carp are thought to feed largely on phytoplankton; they also consume zooplankton and detritus. It is used in controlling water quality, especially control of noxious cyanobacteria (blue-green algae), microcystis .

An extraordinary variety of viruses, bacteria, and organisms stand ready to attack us and feed off our bodies’ cells. Using microscopes of varying power, photographers show us a teeming microbial world that we could barely imagine without their help.

Natural areas in tropical and sub tropical climates are more likely to enhance development of parasitic loads because of the fact that there are variations in climates of these areas in addition to the variations in the type of vegetations and species of wild fauna.

Purpose of study An essential component of the diagnostic process in the evaluation of the disease process is the laboratory diagnosis of any parasitic infection. Sometimes, this confirms the presumptive clinical diagnosis, and other times, it provides evidence that the clinician may have ignored. A sufficient specimen must be used for the examination to achieve a satisfactory diagnosis. Internal parasite testing needs to be done often. Regular inspection typically enables early parasitism identification, preventing gross infection. The majority of the parasites can be accurately identified by doing a detailed examination of the faeces. Faecal sample collection and delivery for parasite identificatio

The domestic duck is an economically important domestic bird in rural areas. They are productive and are reared around the globe for their egg, meat, feather and fattened livers. The worldwide population of ducks (Anas spp.) is 1.15 billion in 2020 out of which 89 per cent were in Asia. China, Viet Nam, Bangladesh and Indonesia are the largest duck rearing countries in Asia (FAO 2020). Geographical location, subtropical climatic condition, water lodged and low areas of the country are suitable for duck habitat. The advantages of ducks over other poultry species are that they are hardy, have higher disease tolerance and are easy to herd.

An Overview of Parasitic Diseases in Asian Aquaculture

Parasitic induced diseases bring about significant economic losses in fish culture system. Estimated loss due to mortality and morbidity of fish due to parasitic infection is much more than that from microbial diseases. Protozoan ciliates (Ichthyopthirius, Trichodina) and flagellates (Ichthybodo, cryptobia) are some of the common ectoparasites of fish. Certain ectocommensal ciliates (Epistylis, Vorticella and Zoothamnium) attach to the external surface of fish leading to fouling. These protozoan ectoparasites are often associated with mortalities of younger stages of cultured fish. The situation becomes worst in water with low oxygen and high organic matter. Most extoparasitic protozoans have simple and short life cycle and reproduce by binary fission. Most protozoan ectoparasites are readily detected in direct microscopic examination of skin and gill scrapings. Histopathological changes in the integument following ectoparasitic protozoan infection are outcome of two counteracting cellular processes – hyperplasia of the epithelial cells, including mucus cells and chloride cells, versus a progressive cellular destruction. Cellular necrosis primarily occurs due to the feeding and attachment activity of the parasites. Generally, immersion therapy using suitable chemicals can control ectoparasitic protozoan infections

Disease caused by endoparasitic sporozoans are a serious threat to fish farms. These sporozoan spores present in the pond soil are normally ingested by the fish. The infective element of the spore (sporoplasm) is released in the gut. The sporoplasm reaches the target tissue using the vascular route. Once inside the target tissue, the vegetative trophozoites cause massive destruction of the target tissue and produce large spore containing cysts. There are two types of sporozoan infecting fish and shell fish namely myxosporidian and microsporidian. Myxosporidian occur in fish either as histozoic (intercellular tissue parasites) or as coelozoic (inside the lumen of various ducts and tubules) parasites. Microsporidians are intracellular obligatory parasites and lead to massive hypertrophy of infected cells (xenomas). There is no effective treatment for sporozoans. However, treating pond soil with chemicals and lime is the best option.

The livestock play a significant role in generating gainful employment in rural areas, particularly among the landless and marginal farmers. The Jammu region of state of Jammu and Kashmir possesses a huge livestock population which is maintained under different management systems. The region has a vast diversity in agro-climatic conditions (comprising low altitude, middle altitude and high altitude), and animal husbandry and pasture management practices. Despite having huge livestock, the production potentials are very low. There are various factors related with low production and among them parasitic diseases rank very high.

1 The causative agent of red water fever in cattle is

a) Babesia bigemina b) Leptospira interrogans

c) Theileria annulata d) Theileria parva

Clinical Symptoms

• Anchor worms can be seen with the naked eye

• Frequent rubbing or “flashing”

• Localised redness

• Inflammation on the body of the fish

• Tiny white-green or red worms in wounds

• Breathing difficulties

Parasitic weeds are a major constraint in tropical agriculture. These are plants that are adapted to live on other plants sharing their nutrients and water. They constitute 1% of flowering plants, approximately 3000 - 5000 species coming under 20 families. Parasitic weeds from five families viz. Orobanchaceae, Convolvulaceae, Santalaceae, Scrophulariaceae and Loranthaceae are considered troublesome weeds as they infest economically important crops in many parts of the world and are very difficult to control by normal weed management measures.

Introduction
Parasitism is a biological interaction in which one organism, the parasite, lives on or within another organism, the host, causing harm. In the context of plant pathology, parasitism is a crucial concept, as many plant diseases are caused by various parasitic organisms, including fungi, bacteria, viruses, nematodes, and protozoa. Understanding the mechanisms of parasitism and pathogenesis is essential for developing effective strategies to manage plant diseases.
Definition & Concept of Parasitism
Parasitism is defined as a symbiotic relationship where one organism benefits at the expense of another. In plant pathology, this interaction typically involves pathogenic organisms that exploit host plants for nutrients, ultimately leading to disease.
Types of Parasites
Plant pathogens are generally categorized based on their nutritional relationships with their host plants. These relationships determine how the
pathogens interact with the host and whether they can survive outside the host environment. There are two primary types of plant parasites:

INTRODUCTION

It can be added that physiological stress as well as the physical offences contribute as primary factor for disease occurrence and fish mortality. Many parasitic diseases due to fluctuation in water quality leads to deplition of stock, and some times total stock will go eg. yellow grub disease.

EFFECT OF TEMPERATURE ON PARASITES

Heterophyid Trematode

Cyprinodon variegatus, an estuarine fish, is heavily parasitized in the bulbus arteriosus by the heterophyid trematode Ascocotyle pachycystis. Parasitized fish ventricles were hypertrophied due to mechanical blockage of normal blood flow by metacercariae in the bulbus Swimming performance generally was reduced by the presence of parasites, which had their most significant negative effect at cold temperatures and low dissolved oxygen level ( Felicia C. Coleman , 1993)

Parasitism
The term parasitism refers to a parasite’s taking of food from its host. Without chlorophyll, fungi are unable to synthesis their own sources of food. Fungi are classified into three main biological groups according on the basis of mode of the nutrient uptake . Parasites, Saprophytes and Symbionts, The term saprophytes, or saprobes, refers to those fungi that feed on dead and decaying organic matter (Gr. sapros rotten + bios life). Some of them have evolved farther, but they are still unable to grow on other living things and can only exist as saprobes. We refer to them as obligate saprophytes(L. Obligare = to bind sapros) . On the other hand, some species live as saprophytes, but under certain circumstances, they can infect another living entity. We refer to them as facultative parasites (Greek parasitos + Latin facultas ability). Many fungus infect living hosts and deprive them of their food. They are called parasites (Greek: parasitos, which means to eat beside). Additionally, a few of them developed into facultative soprophytes (L. facultatas ability + Gr. sapros) after diverging as obligatory parasites (L. Obligar? to bind + Gr. parasitos table mate). Obligate parasites can only grow in culture on living media; in the wild, they can only feed on living protoplasm. On the other hand, facultative saprophytes are basically parasitic organisms but also capable of growing on dead organic matter under some conditions.

Parasitology is the branch of biological sciences that deals with the study of parasites and all the related aspects. This leads to a basic question who is a parasite ? In fact, this term is frequently used in our society for those persons who are doing nothing and depending on others for their survival. The term Parasite means the organism (parasite) which depends on other organism (host) for its nutritional requirements. By definition, it excludes the organisms which are free living and do not depend on other organism for their food requirements. There are other details in fulfilling its nutritional requirements and important one is that in doing so, it causes some harm to the host other wise it will not be a parasite but a commensal.

Corynebacteria are gram positive, non-acidfast, non-motile, non-capsulated, small pleomorphic rods. They frequently occur in rods, coccoid, club and filamentous shape. The term coryneform which refers to the pleomorphic club shape of these gram-positive bacteria. (From Coryne – meaning club). The major pathogen is Corynebacterium diptheria. Which causes diptheria in children. Corynebacteria associated with animals are called diphtheroids.

Morphology
They are gram-positive slender rod with a tendancy to clubbing at one or both ends; they are non-sporing, non-motile, non-capsulated and non-acidfast. They have granules composed of (high energy phosphate stores) – polymetaphosphate. The granules are more strongly gram positive than the rest of the bacterial cell. Stained with Loeffler’s methylene blue, the granules take up a reddish purple color and hence they are called metachromatic granules. They are called as volutinor Babes Ernst Granules. They are often situated at the poles of the bacilli and are called polar bodies. Special stains,
such as Albert’s, Neisser’s and Ponder’s have been devised for demonstrating the granules clearly. Stained smears from animal tissues often reveal groups of cells in parallel (Palisades) or cells at sharp angles to each other (Chinese letter or Cuneiform arrangement). This is due to the incomplete separation of the daughter cells after binary fission. Rhodococcus equi can appear as a gram-positive coccus or a rod or club shaped form arranged in clusters. It is capsulated and sometimes weakly acid fast.

Synonyms : Johne’s disease, Chronic  specific enteritis of cattle, Chronic bacillary dysentery
 
Paratuberculosis (Johne’s disease), an infectious disease caused by Mycobacterium avium subspecies paratuberculosis (MAP), has been recognized as a major disease of ruminants for over a century. It is primarily a disease of domestic and wild ruminants and causes heavy economic losses  in cattle, sheep and goat industry. It is spreading insidiously among animal population worldwide.  Recently it has been shown  that  the disease is not restricted to ruminants only and the host range is expanding to cause disease in other species including Crohn’s disease in humans. In India, the  disease has been occurring  since early 1930s in cattle, sheep and goats in almost every state. The disease in ruminants is clinically characterized by chronic intermittent profuse diarrhea, weight loss, emaciation and finally death.

Introduction

Disease caused by motile Salmonella species in birds is called “Paratyphoid infections”. Paratyphoid infections are present in all parts of the world.

Etiology

Salmonella enterica includes six subspecies. Only one of that subspecies; S. enteric subspecies enterica includes more than 2500 motile serotypes.

34.1 Introduction

Fishes are the first aquatic vertebrates whose life cycle is largely affected by the aquatic habitat. They exhibit much variation in their social life. Some species show no attraction between males and females, conversely, some provide high social attraction and parental care. Therefore, parental care is developed for their social life and habitat.

Parks occupy a unique position in our social life and a common facility to the community for pleasure and utility. The importance of park in urban areas is much more than other areas as these are the only outing places for urban people. Designing park needs careful consideration regarding features, plants and facilities for utility purpose. Roads for public movement, sitting arrangements, flowering and shady trees, flower beds, children’s corner are some of the basic requirements. Free flowering ornamentals requiring less maintenance should be included in the design.

Purpose

Parks are very purposeful in our daily life especially in urban areas. At present provision of parks in a city is must as these provide an open space and an opportunity for outing. Relaxation of body and mind after stressful working or even daily routine work is a must. Parks are the ideal places for such activities, especially very useful for children and elderly people.

Classification

Parks are generally classified according to its type and fulfillment of purposes. Sometimes, a particular theme or type of plantation is followed. Parks are finally categoriesed and named accordingly. Various common classifications are as follows.

ABSTRACT

Insects are considered the most successful in the animal kingdom. Many factors contribute to their success. One major factor that operates strikingly is the economy and optimal use of energy. One can give several examples taking the life of a single insect

Parsley is a popular culinary herb that is grown commercially as an annual plant for its attractive and aromatic leaves in many parts of the world. In Europe, parsley is the most generally farmed herb, and in the United States, it is the most commonly utilised herb. Rather than being a part of the diet, it is utilised as a garnish. The leaves’ oil can also be used to make sauces and spices.

Botany and taxonomy: Parsley is a biennial that is cultivated and managed as if it were an annual. It’s the most popular herb for garnishing and flavouring. Parsley comes in two varieties: moss-curled and flat-leaf. Moss-curled produces a rosette of finely cut and tightly curled leaves. It develops as a biennial, with a rosette of tripinnate leaves 10-25 cm (4-10 in) tall, numerous 1-3 cm (0.4-1.2 in) leaflets, and a taproot that serves as a winter food store. It develops a blooming stem with sparser leaves and umbels of yellow to yellowish-green flowers in the second year. 

In the 14th century, the term “parsnip” was borrowed into Middle English as a modification of the Old French word “pasnaie,” which was derived from the Latin noun “pastinaca,” which meant “parsnip” or “carrot.” This history is still reflected in the scientific name for the parsnip, “Pastinaca sativa.” The parsnip is a native of Eurasia; it has been farmed by the Romans and has been used as a vegetable since antiquity, but there is some misunderstanding between parsnips and carrots in historical texts. Prior to the arrival of cane sugar in Europe, it was employed as a sweetener. Parsnips are carrot-shaped root vegetables that are cream-colored and belong to the parsley family. Although they can be eaten fresh, they are more commonly roasted, boiled, fried, or steamed. The thin, tan peel of parsnips is usually peeled before use, revealing white flesh beneath.