eChapters

Sensing of heterogeneities in the field is the prerequisite for timely and spatially adjusted insect pests and disease management. Recent developments in sensor technologies have led to a broadening of their capacity to detect pests and thereby improve application in crop protection practice. These sensors can be space-borne (satellite), air-borne (airplane, unmanned aerial vehicle) or groundbased (handheld, vehicle-mounted) and provide spatial information that has added value management. Insects are usually unevenly distributed throughout an area in nature. Despite this knowledge, analytical methods and technology have limited insect pest management to uniform management decisions in the field. The methods and technology to map and analyse insect spatial distribution have been developed to a level where the uneven nature of insect populations can be considered for application of insect-pest management practices. Site-specific pest management utilizes spatial information about pest distribution to apply control method only where pest density is economically high within a field. This results saving in pesticide and labour cost. In conventional farming pesticides are applied uniformly to the field resulting in heavy use of pesticide and labour beside polluting the environment. Site-specific application of pesticides in precision farming helps to overcome this problem

Near-range and remote sensing techniques have demonstrated a high potential in detecting diseases and in monitoring crop stands for sub-areas with infected plants. The occurrence of plant diseases depends on specific environmental and epidemiological factors; diseases, therefore, often have a patchy distribution in the field. The use of non-invasive optical sensors for the detection, identification and quantification of plant diseases on different scales is made of in precision farming. Most promising sensor types are thermography, chlorophyll fluorescence and hyperspectral sensors. For the detection and monitoring of plant disease, imaging systems are preferable to non-imaging systems. To utilise the full potential of these highly sophisticated, innovative technologies and high dimensional, complex data for precision crop protection, a multi-disciplinary approach—including plant pathology, engineering, and informatics—is required.

Precision agriculture is yet to be popularized for taking its enormous advantages. In laser land levelling and micro irrigation/ fertigation it must have made its prominence but others it is with research institutes where research is focussed on the spatial variability of production environments, development of efficient and suitable data management systems, efficiency of various types of image analyses and optical sensing, efficiency of sensors and related technologies, designs of precision agriculture equipment, optimal inputs and service uses, and their spatial allocations, potentials of unmanned aerial vehicles (UAVs), nanotechnologies and several others.The adoptions of precision-agriculture technologies have, so far, mostly been limited to parts of developed countries. Major contributions to the profitability of precision agriculture is reduced costs of plant protection inputs and higher output revenues.

Drainage is the natural or artificial removal of excess water from a surface or sub-surface from an area or field or soil or greenhouse. The internal drainage of most agricultural soils in greenhouse is good enough to prevent severe waterlogging. Water logging creates anaerobic conditions that harm root growth in absence of oxygen. Soils need artificial drainage to improve production or to manage water supplies in certain conditions. Though the roots need moisture but they need oxygen too and poor drainage is g result in roots rotting and death of plants.

The irrigation water inside the greenhouse may accumulate and cause anaerobic condition. Similarly plants in pots should not accumulate water. Water should not stand in pots and beds for longer period. If it stays longer drainage is poor and needs to be corrected. It is better to have good drainage system in greenhouses or protected structures.

Besides irrigation rains water seeps in the greenhouse. The drainage system prevents running or its accumulation in low lying portion of the greenhouse. Drainage system in greenhouses is a must for avoiding damage to the crops.

Pasteurization: The heat treatment given to soil to free it of harmful microorganisms or pathogens and pests is called pasteurization. It kills weed seeds also.

Pasteurization of greenhouse plant growing media

Greenhouse growing medium may contain harmful pests such as disease causing organisms, nematodes, insects and weed seeds. It is advisable to decontaminate it by heat treatment or by treating with volatile permissible chemicals.

Soilless media or culture

Gravel culture is a general term which applies to the growing of plants without soil in an inert medium into which nutrient solutions are usually pumped automatically at regular intervals. Haydite (shale and clay fused at high temperatures), soft- or hard-coal cinders, limestone chips, calcareous gravel, silica gravel, crushed granite and other inert and slowly decomposing materials are included in the term “gravel”. The more important greenhouse flowering crops include roses, carnations, chrysanthemums, gardenias, snapdragons, lilies, asters, pansies, annual chrysanthemums, dahlias, bachelor buttons and others.

Media ingredients and Mix

Commercially available materials like peat, sphagnum moss, vermiculite, perlite and locally available materials like sand, red soil, common manure/ compost and rice husk can be used in different proportions to grow greenhouse crops. These ingredients should be of high quality to prepare a good mix. They should be free from undesirable toxic elements like nickel, chromium, cadmium, lead etc. Most common medium other than soil used in India in greenhouses is coco peat. In other countries these are Rockwool and Peat-vermiculite.

1. Botanical name : Corylus jacquemontii Decne

2. Family : Betulaceae

3. Common Name : Indian Hazelnut

4. Name in Indian languages

Bhotiya badam, Kabasi (Hindi), Thangi, Thankoli, Shalodi, Urmuni, Sharoli and Sharod (Himachali).

5. Description

Indian Hazelnut is a wild plant of the mid and high hills of the Himalayas. The tree is small or medium-sized and deciduous. Leaves are ovate or obovate, irregularly lobed or toothed, silky pubescent on nerves beneath. Flowers emerge before the leaves. Male flowers are arranged in drooping spikes while female flowers are cone-like, small, ovoid produced in pairs.

1. Botanical Name : Debregeasia velutina Gaud

2. Family : Urticaceae

3. Common Name : Wild Rhea

4. Name in Indian languages

Syaru (Kumoani), Poonoolmaram, Neeranji, Narambili, (Malayalam), Kaattu, Nochchi, Katunochchi, (Tamil), Sansaru (Hindi), Garuga (Kannada), Tussare (Nepali), Khargul(Marathi), Syaru (Garhwali).

1. Botanical Name : Docynia indica Syn. Docynia hookeriana, Syn. Docynia rufifolia, Syn. Malus docynioides, Syn. Pyrus indica, Syn. Pyrus rufifolia

2. Family : Rosaceae (Pomeae)

3. Common Name : Mehal

4. Name in Indian languages

Sohphoh (Khasi), Mel, Mehal (Nepali), Tong, Thung kakpa (Bhutan).

5. Description

Docynia indica is deciduous tree found in India and South East Asia. The trees are medium to tall in height. It requires a well-drained soil in a sunny position. This species can tolerate temperatures down to about -5 to -10°C. Fruits are acidic and greenish with red tinged. Fruits are eaten as fresh or pickles as well used in jelly preparation. It is also used as rootstock for imparting semi-dwarf in apple.

1. Botanical Name: Elaegnus parviflora Wall. Ex. Royle

2. Family: Elaeagnaceae

3. Common Name: Autumn Olive

4. Name in Indian languages

Giwain, Kankal (Hindi, Kumoani), Heiyai (Manipuri), Guenlee (Nepali).

5. Description

Autumn olive is a small tree or shrub, often spiny. The small white (fading to yellow) flowers have a sickly-sweet aroma.

6. Origin and distribution

Autumn olive is found in the Himalayas, from Kashmir to Bhutan, Assam and western China, at altitudes of 1300-3000 m.

1. Botanical Name : Elaeocarpus munronii (Wt.) mast)

2. Family : Elaeocarpaceae

3. Common Name : Kalarudraksha

4. Name in Indian languages

Idanji pan (Koodwa), Nari Bikki, Kal Bikki (Kannada), Rudraksham (Tamil), Kalarudraksham, Shirukodala (Malayalam).

5. Description

Elaeocarpus munronii is plant in the Elaeocarpaceae family. It is found only in India. It is threatened by habitat loss. Trees grows up to 15 m tall.Trunk is greyish, smooth and blaze cream. Leaves are simple, alternate, 4-9 cm long , ovate Flowers axillary in racemes, white. Fruit is Drupe, elliptic and 2 cm long, smooth with single seed

1. Botanical Name : Elaeocarpus tuberculatus Roxb.

2. Family : Elaeocarpaceae

3. Common Name : Warty Marble Tree

4. Name in Indian languages

Kooge pan (Kodwa), Dandale Mara, Kadambola, Kunge Mara (Kannada), Badraksham, Rudraksham, Pahumban, Kara, Ammakorum, Adraksham, Mukkanni, Vellathaanni, Thodayam (Malayalam), Malampinnai, Pathrachi, Ruthraksham (Tamil).

1. Botanical Name : Flacourtia montana J. Graham

2. Family : Flacourtiaceae

3. Common Name : Mountain Sweet Thorn

4. Name in Indian languages

Raan-tambut (Marathi), Caralvvazham (Malayalam), Attak, Hennu Sampige (Kannada), Atak, Chamfar(Konkani), Attak (Gujarati), Male Kakkade (Kodwa).

1. Botanical name : Fragaria indica Andr.

2. Family : Rosaceae

3. Common Name : Wild strawberry, Indian Strawberry, Mock strawberry

4. Name in Indian languages

Kiphaliya (Hindi), Kaphai (Kumaoni), Kakyen, Khujin, Laba, Linmahu (Manipuri), Sarpe Phool, Bhuin aiselu (Nepali), Bhuinaakhe, Kophal (Himachali).

5. Description

It is small perennial herb. It is found in cool and shady locations in wastelands as well as in the cultivated fields. The fruits are bright-red color, The plant resembles the strawberry to a great extent.

1. Botanical Name : Leptadenia pyrotechnica Forssk. Decne

2. Family : Apocynaceae

3. Common Name : Kheep, Broom bush

4. Name in Indian languages

Kheep (Hindi), Khip(Punjabi), Jivanti (Sanskrit).

5. Description

It is a much branched often leafless erect shrub. The edible part is tender fruit. It can grow up to 3 metres height. A desert plant, it is often utilized by local people within its native range, particularly as a fibre plant and for fuel. It is also planted in soil stabilization in arid areas.

6. Origin and distribution

It is originated from North Africa to desert areas to Western India. It is distributed throughout the arid zone of Rajasthan particularly in Jodhpur, Bikaner, Jaiselmer districts of Rajasthan. Kheep is also found gorwing in Pakistan, Iran, Arabia, Egypt, Sudan, Somalia, Chad, Libya and Algeria.

1. Botanical Name : Prunus persica Batsch

2. Family : Rosaeceae

3. Common Name : Wild peach

4. Name in Indian languages

Kateru, Katakiaru (Himachali), Kathu aru (Kumaoni).

5. Description

The wild peach is closely related to cultivated peach. Many wild forms of peach are found in Himalayan hills. The most distinguishing feature of this form is the very late ripening of its fruits. The fruits of this wild plant ripen at some places as late as October. The fruits are smaller than cultivated varieties and bitter and acidic in taste.

6. Origin and distribution

The peach is native to himalayan region. These wild peaches are found in plenty in the Solan, Sirmur and Simla Districts of Himachal Pradesh. The plants are also found Kumaon and Garhwal divisions of Uttarakhand.

1. Botanical Name : Pyrus pashia L.

2. Family : Rosaceae

3. Common Name : Himalayan pear, Indian wild pear, Wild pear

4. Name in Indian languages

Kainth, Chotia, Kaimh, Shegal (Himachali), Mehal, mol (Hindi), Mehal, mol (Kumaoni), Mayal, Passi (Nepali), Kainth, Shegal (Punjabi), Sohshur (Khasi), Soh ait-syiar (Pnar), Tangi (Kashmiri).

5. Description

Himalayan pear is a small, deciduous tree of rosaceae family. It is common in open field borders and forest margins from 1000-2400m. The tree reaches up to a height of 5-8 m. The stem is greyish brown and rough. The flowering takes place in the month of February-March and the fruits mature in month of October to November. Fruits are globose, brown ultimately becoming black and rough. The fruits are astringent in taste when immature. The ripe fruits are sour -sweet with some astringency. This is widely used as rootstock for pear.

1. Botanical Name : Pyrus serotina Rehd.

2. Family : Pomaceae

3. Common Name : Wild pear (large-fruited type)

4. Name in Indian languages

Bada kainth, Shiara, Zarenth (Himachali), Shiara, Garmehal (Kumaoni).

5. Description

The trees of Pyrus serotina is found throughout the mid-hill region of Himalaya. The population of this species is very less as compare to Pyrus pashia. The fruits of this species are larger and less gritty. It is cold-hardy, tolerate low temperatures when dormant. It also has lower chilling requirements than most other.

6. Origin and distribution

It is native of central and East Asia form . It found in North Western Himalayan region.

1. Botanical Name : Rourea minor (Gaertn.) Alston

2. Family : Connaraceae

3. Common Name : Cow Vine, Big-leaved Rourea

4. Name in Indian languages

Cheriyamarikunni, Kuriel (Malayalam), Puli pan (Kodwa), Hulimajge hannu (Kannada).

5. Description

It is a large woody climbing shrubs of family Connaraceae. Stem is black. Leaves are compound with 3-7 leaflets. Flowers in axillary panicled cymes.The fruits ripe in June –August. Whole fruit expect the rind and seed is consumed at ripe stage. It is rarely found. Rourea minor is a vigorous climbing shrub producing stems up to 25 metres long that climb into the surrounding vegetation.Although poisonous, the plant is sometimes harvested from the wild for local use in traditional medicine.

1. Botanical Name : Rubus paniculatus Smith

2. Family : Rosaceae

3. Common Name : Heart-Leaf Raspberry

4. Name in Indian languages: Kothalu, Kala hinsar (Hindi/Garhwali)

5. Description

Heart-leaf raspberry is a rambling climber, distinguished by its large ovate-heart-shaped, finely toothed leaves. It is a deciduous shrub, producing each year a cluster of scrambling, minutely-prickly, biennial stems up to 300 cm tall. The stems only produce leaves, and do not flower, in their first year of growth; forming flowering branches in their second year and then dying after fruiting. The plant is harvested from the wild for local use as a food, and sometimes also as a medicine.

6. Origin and distribution

It is native of Himalayas and found in the higher hills in Uttarakhand and Himachal Pradesh. It is also found in Nepal, Bhutan and China. The plants are at elevations from 1,500 - 2,900 metres msl. It is found in damp shady ravines to 1800 metres in Jaunsar and Tehri-Garhwal of Uttarakhand.

1. Botanical Name : Salacia chinensis L.

2. Family : Celastraceae

3. Common Name : Chinese salacia

4. Name in Indian languages

Chourondi (Malayalam), Saptachakra (Sanskrit), Chuntan, Karukkuvai (Tamil).

5. Description

It is a usually climbing plant, though is sometimes a scrambling shrub and occasionally becomes more tree-like. It can grow from 3 - 10 metres tall with a stem up to 16cm in diameter. The plant is harvested from the wild for local use as a food and medicine.

6. Origin and distribution

It is originated in coastal India, China, Sri Lanka, Myanmar, Indonesia, Cambodia, Laos, Vietnam, Malaysia, Indonesia, Philippines. It is distributed in the Indian subcontinent, including the semi-evergreen forests of the Coastal Karnataka, Kerala and Tamilnadu.

1. Botanical Name : Securina leucopyrus syn. Flueggea leucopyrus

2. Family : Euphorbiaceae.

3. Common Name : Bushweed, Indian snow berry, White honey shrub

4. Name in Indian languages

Katupila, Shinar (Hindi), Pandharphali (Marathi), Mulluppulatti (Tamil), Cerimklaav (Malayalam), Pulugudu (Telugu), Bilchuli (Kannada), Parpo (Konkani), Humri (Gujarati), Shwetakambuja(Sanskrit), More pan (Kodwa).

5. Description

Bush weed is an erect shrub of family Euphorbiaceae. The plant grows up to 4 m tall with branches cylindrical or obtusely angular. Leaf is elliptic, obovate, or round papery to thinly leathery. Flower cymes arise in leaf axils or at leafless nodes. Flowers are tiny and yellowish. Fruit is a nearly spherical berry, about 4 mm in diameter, whitish when ripe.

1. Botanical Name : Tamilnadia uliginosa (Retz.) Tirveng. & Sastre

2. Family : Rubiaceae

3. Common Name : Divine Jasmine, Tamilnadia

4. Name in Indian languages

Kalaphendra (Marathi), Wagatta, Kalikarai (Tamil), Pindichakka (Malayalam), Kuka-elka (Telugu), Pidaar(Nepali).

5. Description

Divine jasmine is a very rigid, ramous, small tree, armed with numerous strong thorns. This found in bogs, swamps, banks of rivers and other moist places. It flowers in the beginning of the hot season. The flowers of this species, are known for beauty. It is good shrub for flower garden. It is an important medicinal plant because each and every part of it can be used for medicinal purposes. Sometimes leaves of the plant are used to make chutney.

6. Origin and distribution

It is native of India. It is distributed in India, Bangladesh, Srilanka, Thailand, Vietnam. In India, this species is found in moist deciduous forests.

1. Botanical Name : Vitis himalayana Br.

2. Family : Vitaceae

3. Common Name : Wild grape, Himalayan Woodbine

4. Name in Indian languages: Bhambti, phlankur (Himachali), Chappar tang, Bara churcheri (Kumaoni).

5. Description

This climbing shrub is commonly found in the forests. One of the important characteristics of this wild grape is that they ripen very late i.e., in October. The plant has tuberous roots.

6. Origin and distribution

Himalayan Woodbine is found in the Himalayas, from Pakistan to Sikkim, South West China and Myanmar at altitudes of 1800-3300 m. In India, it is found in Himachal and Uttarakhand.

7. Morphology

Himalayan Woodbine is a very large climber, growing to 18 m long. It has trifoliate leaves with 3 ovate long-pointed, sharply toothed, stalked leaflets. Leaves are shining green above and pale on the underside, about 10 cm long. The lateral leaflets have asymmetrical bases. Flowers are tiny, yellow-green, in spreading flat-topped clusters. Flowers have petals about 5 mm long, with 4-5 stamens. Fruit is a black berry.

1. Botanical Name : Vitis lanata Roxb.

2. Family : Vitaceae

3. Common Nam : Wild grape

4. Name in Indian languages

Bhambay (Himachali), Asajiya, Asoja, Paharphuta, Purain (Kumaoni), Kolo, Kolo nari (Santali).

5. Description

Vitis lanata grow naturally throughout the sub-Himalayan tract, ascending up to 1,500 metres in Himachal Pradesh and Uttarakhand. It is woody climber.

6. Origin and distribution

It is native of East Asia from Himalaya to China. It grow wild in the northwestern Himalayan foothills. It is found in hills upto 1500 metres in the Himalayas particular on moist open rocky places.

1. Botanical Name : Xeromphis spinosa (Thumb.) Keay

2. Family : Rubiaceae

3. Common Name : Thorny Bone-apple, Common emetic nut

4. Name in Indian languages

Mainphal (Hindi), Ghela, Khajkanda(Marathi), Madkarai (Tamil), Karacchulli (Malayalam), Marrga (Telugu), Kaarekaayi-gida (Kannada), Patova (Oriya), Madanah (Sanskrit), Kare pan (Kodwa).

5. Description

Xeromphis spinosa is a plant of family Rubiaceae. It is a spiny, deciduous shrub or small tree growing up to 7 metres tall. The plant sometimes adopts a climbing habit. The fruits matures in the month of June-July. The whole fruit expect the seed is consumed at ripe stage.

6. Origin and distribution

It is native of East Asia, Southern China, Indian subcontinent, Malaysia, Vietnam, Indonesia. It is found all over India except higher hills. It is also found in the Himalayas, up to an altitude of 1600 m. It is common in hilly area of Rajasthan.

1. Botanical Name : Zizyphus rugosa Lamk

2. Family : Rhamnaceae.

3. Common Name : Wild Jujube, wrinkled jujube

4. Name in Indian languages

Churna, Suran (Hindi), Toran, Turan (Marathi), Totari (Tamil), Thodali, Tutari (Malayalam), Gottichettu (Telugu), Belahadu, Mulluhannu (Kannada), Kotte pan (Kodwa).

5. Description

Zizyphus rugosa is a large armed, spiny, evergreen tree growing around 5 - 9 metres tall with large elliptic usually subcordate leaves, paniculate flowers and wood is reddish, moderately. This plant is found chiefly in deciduous and semi-evergreen forest, hills and mountains below 1200 m altitude. The leaves are simple, and are broadly elliptic and short tips. Fruits are globose or pyriform, white when ripe. Whole fruit expect the seed is consumed at ripe stage. It is found in degraded forest areas of entire of Western Ghats. The plant is harvested from the wild for local use as a food and a medicine.

Beta vulgaris 2n = 2x=18 is an important vegetable crop in Eastern and Central Europe and it belongs to family Chenopodiaceae. It is of lesser importance in Western Europe and USA where it is known as garden beet. The swollen roots are consumed as vegetable and salad. The other types which are non-horticultural forms are known as sugar beet, mangold and fodder beet.
Origin: Leaf beet is the earliest domesticated form. It is believed to be originated from Beta maritima known as sea beet which is indigenous to Southern Europe. 
Botany: Biennial producing enlarged hypocotyl (roots) and rossette of leaves in first year and flowers and seeds in second year.

Turnip is the root vegetable cultivated in cooler season or temperate regions of the globe. Brassica rapa L 2n = 2x = 20 is formerly known as B. campastris subsp rapifera. Swede (B. napus var. napobrassica) is directly related to turnip.
Origin: It is originated in cooler part of Europe, presumably from biennial oilseed forms. It was known to Greeks and Romans at beginning of Christian era. It was introduced to Britain from France by Romans and into North America by the early European settlers in the 17th century.

Collect the femur and tibia and clean them very well from blood, tendons, muscle, skin and other tissues (using scalpel)

Cut off epi-and metaphysis from the long bones with electric/manual bone saw
Transfer the open bones to a falcon tubes containing cell culture medium/DPBS without FBS but containing 1% PS (Penicillin-streptomycin)
Transfer the bones to a Petri dish containing 5 ml medium without serum (FBS) and without antibiotic (40-50 mm Petri dish)
Remove the pteri dish to the laminar cabinet
Collect the bone marrow by flushing out to a 50 ml falcon tube (use syringes and needles to flush out the bone marrow; flush out the bone marrow with complete (10% FBS, 1% PS, 90% DMEM-LG) culture medium
Centrifugation: 300rpm, 8 min (in the meanwhile prepare 5 ml of Ficoll into a 15ml falcon tube)
Aspire the medium

1.    Collect fat tissues from euthanized animals into a Falcon tube containing DPBS + 1% PS ( for transferring lab to lab)
2.    Wash 3 times with DPBS + 1% PS
3.    Inside a laminar cabinet, transfer the fat to a Petridis (use an sterile spatula to collect the fat)
4.    Cut the fat into small (mm) pieces using scalpel and forceps or scissors
5.    Transfer the fat into a Falcon tube (eg into a 50 ml Falcon tube you can add upto 10 ml fat tissues)
6.    Wash the fat by adding approx 40 ml DPBS; Centrifugation: 430g, 10 min (without break)
7.    Transfer the fat into a fresh 50 ml Falcon tube (with the help of sterile spatula); Repeat steps 5 to 7 for 2-3 times

1.    Collect the bone marrow from iliac crest of rabbit, dog, goat and sheep; sternum of pigs by 16-18 G bone marrow biopsy needle under sedation/anesthesia and maintain strict asepsis protocol
2.    To aspirate bone marrow, negative pressure should create in the syringe by pulling back the plunger. Syringe should be first flushed with heparin before bone marrow collection
3.    Collect approximately 2.5-5 ml of bone marrow from each animal
4.    Mix the bone marrow sample with equal volume of low DMEM having 10% FBS and 1 ml of PS and then layer on 5 ml of histopaque/Ficol-Paque Plus in a falcon tube
5.    Centrifuge at 3000 rpm for 30 min
6.    Collect stem cells from the interface with the help of a micropipette
7.    Cells wash thrice with DPBS 
8.    Centrifuged at 2000 rpm for 5 min

1.    Remove the growth media
2.    Wash 2 times with warm PBS (w/o Ca and Mg)
3.    Add 5ml of trypsin /EDTA 0.35 % (Invitrogen), place at 370C in a CO2 incubator for 4-5 min
4.    Wait until cells are detached/lifted and make sure by examining on microscope
5.    Add equal volume (5ml-1:1) of growth medium as appropriate and mix with 5 strokes
6.    Transfer into 15 ml centrifuge tube
7.    Centrifuge at room temperature for 4 min in 980 rpm
8.    Remove supernatant complete but carefully without touching the cell aliquot
9.    Re-suspend in 10ml DPBS (with Ca and Mg)-5 strokes
10.    Immediately after mixing transfer 100µl of cell suspension into Casy vial, containing 10ml Casyton

5.1 Downy Mildew of hemp

Pathogen: Pseudoperonospora cannabina

Geographical distribution
 
It’s spread has been limited to Asia and Europe.

Symptoms

Downy mildew begins as yellow leaf spots of irregular size and angular shape, limited by leaf veins. Opposite the spots, on the underside of leaves, the fungus emerges from stomata to sporulate. Mycelial growth on the underside of leaves is best seen in early morning when dew turns the mycelium a lustrous violet-grey colour (Fig 5.1). Lesions enlarge quickly and affected leaves become contorted. Leaves soon become necrotic and fall off. Whole plants and entire fields may follow this pattern.

Fruits have been one of the earliest foods of mankind. Ancient Indian texts like Charak Samhita and Sushruta Samhita, religious books and puranas are replete with mention of various kinds of fruits. The mango is believed to have been grown for more than 4000 years. Mention of apple, the forbidden fruit, in the Holy Bible is well known. The date-palm is recorded as the fruit crop grown by mankind since 7000 BC. The first book in the world on fruit culture is said to have been the one written on litchi in 1056 AD. In the earlier period of human civilization, fruits served both as food and medicine. Fruits, nuts and tubers were the staples for early wanderers and gatherers. The settled agriculture made mankind more dependent on cereals, pulses and oilseeds for staples and fruits, vegetables and nuts became more a medicine than food.

Many evolutionary and anthropological changes occurred in course of time with changing food habits. At every stage of major change, food habits determined the life expectancy. After completing a full cycle or helix, time has returned to focus on fruits and vegetables again as food, from a stand point of health and wellbeing. From being trees of wild and forests in earlier period, fruit crops became confined to palaces and orchards of Kings in medieval period. In modern Era, it came to stay as commercial commodities dictating the terms of trade. Due to its growing commercial importance the governments across the globe focused to expand the area under fruit crops and cross border trade in several fruits and vegetables. Horticulture research started prioritizing the traits in fruits that determine the economics of trade. In line with these developments, Indian government assigned great significance to horticultural crops since 8^th five-year plan period, and the allocation for horticultural research was increased to `110.2 crores from `31.96 crores in the previous plan. During the 10^th five-year plan period in 2005-06, the National Horticulture Mission was started. As the net outcome of these efforts, the area under fruit crops increased from 2.87 million ha in 1991-92 to 6.48 million ha in 2016-17. The production increased from 28.63 million tonnes to 92.85 million tonnes and productivity from 9.96 tonnes/ha to 14.33 tonnes/ha during the same period (Anon, 2017).

Out of the total value of output of agricultural crops, fruits and vegetables contribute the lion’s share of 23%. The major fruit crops producing states are Andhra Pradesh, Maharashtra, Uttar Pradesh, Gujarat, Madhya Pradesh, Karnataka, Tamil Nadu, Bihar, West Bengal and Chattisgarh. The major fruit crops grown are banana, mango, citrus fruits (sweet orange, mandarin, lime & lemons), peach, guava, papaya, pomegranate, sapota, apple, pineapple, ber, litchi, avocado, etc. Several minor crops like jackfruit, aonla, bael, jamun, custard apple, fig, karonda, phalsa, carambola, etc., are also grown. Some exotic fruit crops like dragon fruit, kiwi, durian, Malayan apple, rambutan, etc., are also getting imported either due to its extra ordinary taste or exotic flavor.

Cherimoya is considered as the most esteemed of the fruits of the genus Annona (family Annonaceae). A. cherimola Mill., because of its limited distribution, has acquired few colloquial names, and most are merely local variations in spelling, such as chirimoya, cherimolia, chirimolla, cherimolier, cherimoyer. The cherimoya is believed to be indigenous to the interandean valleys of Ecuador, Colombia and Bolivia. It is cultivated in Australia, Hawai, Brazil, Mexico, India, Sri Lanka, Jamaica, Spain, Costa Rica, Africa and Argentina. In India it is found growing in states of Maharashtra, Tamil Nadu, (Nilgiris and Palani hills), Karnataka (the Nandi hills) and Andhra Pradesh (Telangana region).

It bears fruits with skin which is thin or thick, may be smooth with fingerprint-like markings or covered with conical or rounded protuberances. The sweet, juicy, white flesh is melting, subacid and very fragrant. The fruit is of a primitive form with spirally arranged carpels, resembling a raspberry. Each segment of flesh surrounds a single hard black bean-like seed.

Cultivars: Fingerprinted, Smooth, Tuberculate, Mammilate and Umbonate are the cultivars having different shapes, texture and morphology.

Uses

The flesh of the ripe cherimoya is most commonly eaten out of-hand or scooped with a spoon from the cut open fruit. It really needs no embellishment but some people in Mexico like to add a few drops of lime juice. Occasionally it is added to fruit salads or used for making sherbet or ice cream. Colombians strain out the juice, add a slice of lemon and dilute with ice-water to make a refreshing soft drink. The fruit has been fermented to produce an alcoholic beverage (Morton, 1987). In Jamaica, the dried flowers have been used as flavoring for snuff. All species of Annona can produce seed oil. Essential oils extracted from soursop (pulp) have industrial applications and the oils are also thought to improve the flavour of processed fruit products.

Vegetables are important accompaniments for the main course of meal, which is by and large a carbohydrate-based food (wheat, rice or millets). It not only makes the meal more palatable, but also wholesome with its diverse color, smell and taste. More importantly it facilitates the easy movement of food through the bowel, better absorption by the body and till the elimination. Besides hunger satiation, it helps to maintain the health by providing the essential micronutrients and prevent lifestyle disorders.

As a nutritious food, it provides the vitamins, minerals and phyto-chemicals which are required in small quantities for physiological processes and metabolic activities. They are cheap sources of beta-carotene, vitamin-B complex, folic acid, vitamin C, vitamin E, etc. They are rich in minerals like iron, calcium, magnesium, phosphorus, etc., and dietary fibres. It has now been proved that minerals are better absorbed by the body in presence of several other factors of plant matrix, than as mineral supplements. It also provides small amounts of carbohydrates and proteins. Vegetables are important as protective foods as their consumption prevents many diseases. They are important sources of antioxidants and phytochemicals. Each vegetable has been found to have certain specific phyto-chemical which besides being a free radical scavenger, is also inhibitor of certain conditions responsible for disease development.

Among the vegetables, tubers like cassava, potato and sweet potato being highly rich in carbohydrates, served as staples for several countries for very long time, in the history. For the same reason, there are a variety of food products based on these tubers. Others like carrot, radish, beetroot, and turnip in root vegetables, onion and garlic among bulbous crops; tomato, brinjal (egg plant), okra and capsicum among fruit vegetables serve as sources of phytochemicals (carotenoids, anthcyanins, lycopene, betalain, capsicum, bassiniloids, etc.). Beans, peas, cowpea, and other leguminous vegetables are important sources of proteins and leafy vegetables (greens) contribute to the much-needed minerals, vitamins and fibre (roughages) in the diet. Allicin and diallyl disulphide found in onion and garlic control blood cholesterol besides being anti-bacterial. The diphenylamine in onion is effective against diabetes. The ‘Charantin’ found in bitter gourd have hypoglycaemic activity. Diosgenin in yams are used for manufacture of contraceptive drugs. Cole crops like cabbage, cauliflower, Brussel sprouts and sprouting broccoli have anti-carcinogenic properties mainly due to hydrolysed glucosinolate derived isothiocynates and indoles. Similarly, health benefits and curative properties of many indigenous and exotic vegetables have been mentioned in several classical texts of India and China.

The social area analysis model of urban structure incorporates all three aspects of city structure, namely concentric zones, sectors and multiple nuclei. It is a more comprehensive statement of urban forms. The model was developed by R.A. Murdie in 1969. According to this model, the physical space of streets, buildings and roads are superimposed by three dimension of social space (Fig. 8.1). The social criteria are the following:

Family Status

Family status indicators include population and age variables, house ownership and age characteristics, family size and marital status and other life cycle. These exhibit a concentric zonal or ring pattern with older, smaller renter households located near the city centre and owner occupied newer larger family households near the outer fringe.

Economic Status

Economic status tends to include measure of income, occupation and education. This portrays a distinct sectoral pattern with definite high income and low income sectors.

Walter Isard had given the location theory in 1956 vided publication entitled, Location and the Space Economy. Isard has modified the Loschian schema, in the attempt to make it more realistic. Isard linked location theory to the general theory of economics through the substitution principle.

In economic theory, capital can be substituted for labour, for example. Similarly, the selection of a manufacturing site from among alternative locations can be viewed as substituting expenditures among the various production factors such that the best site is chosen. (Fig.10.1) provides one simple illustration of Isard’s substitution principle.

Pie charts are useful to compare different parts of a whole amount. They are often used to present financial information. E.g. A farmer’s expenditure on farm can be shown to be the sum of its parts including different expense cate- gories such as cultivation, irrigation, sowing, harvesting, and general running costs (i.e. rent, electricity, fuel etc).

A pie chart is a circular chart in which the circle is divided into sectors. Each sector visually represents an item in a data set to match the amount of the item as a percentage or fraction of the total data set.

STANDARD NORMAL DISTRIBUTION

If μ = 0 and σ = 1, the distribution is called the standard normal distribution or the unit normal distribution, and a random variable with that distribution is a standard normal deviate. The approximate test is given by

9.7.1. Function

The front axle is the unit on which the front wheel is mounted. This wheel is an idler wheel by which the tractor is steered in various directions. The function is to assist the steering and support the tractor. It is a rigid tubular or I-section steel construction, pivoted at the centre. The pivot pin is housed on bushings on a support bolted to the front of the engine. As the track width of a tractor is adjustable, the front axles have provision to be extended on both sides. The tubular front axles have telescopic arrangement for extension, whereas the I-section type of front axles are three-piece axles.

This chapter deals with the maintenance, repair, safety and trouble shooting of agricultural implements, equipment and machinery.

Routine maintenance reduces repair bills and extends the life of equipment. Good maintenance practices are essential for efficient operation of all types of farm machineries. Effort spent in this area of farm management is more than repaid by the consistent, reliable operation of machinery, reduced fuel bills and extended life of equipment. Maintenance of farm machinery is complicated by the usage pattern of short spells of intense activity, followed by periods of non-use or storage.

During the “standing” or non-use periods chemical interactions between metals and fluids can cause more damage than normal wear and tear from active usage. This must be considered in planning machinery maintenance.

Founded in 1924, with the aim to develop and publish standard procedures in the field of seed testing, with member laboratories in over 70 countries world wide. ISTA membership is truly a global network. ISTA secretariat is located at Zurich, Switzerland.

1. VISION AND MISSION

ISTA members work together to achieve their vision of ‘Uniformity in seed quality evaluation worldwide’. The association produces Internationally agreed rules for seed sampling and testing, accredits laboratories, promotes research, provides International seed analysis certificates and training and disseminates knowledge in Seed Science and Technology. This facilitates seed trading Nationally and Internationally and also contributes to food security.

1. DUS TEST

A variety shall express distinct character(s) for verification, uniformity within population and stability for expression of such characters over the year and at different locations, then only its genetic purity is confirmed.

1.1. Requirements

Authentic seeds of existing varieties, pure seeds of variety under tests, list of characters to be examined and their expression.

This test is conducted in the most optimum conditions of soil and climate and the crop is exposed to the best agronomic management conditions to ensure full expression of the characters.

1.2. Distinctness

The variety under test is compared with the existing varieties (having similar plant height, growth habit, days to flowering, days to maturity and reaction to diseases) for qualitative morphological characters at seed, seedling and plant levels. Biochemical differences may also be considered. To establish the distinctness, the test is performed for 2 years for self pollinated crops.