PATH 372 Diseases of Horticultural Crops

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Survival and spread P.I: Survives through teliospores in cooler regions and on collateral hosts S.I: Wind borne Uredospores Host range: French beans, green gram, black gram and cowpea Management Adjust sowing dates to avoid severe infection of plants in the field Protect the crop with mancozeb or zineb @ 2 kg/ha or wettable sulphur @0.3% 3) Yellow mosaic: Bean Yellow Mosaic Virus, Mungbean yellow virus or Phaseolus virus-2 (ss DNA virus) Symptoms Bright yellow patches appear on leaves. Yellow areas alternate with dark green areas of the leaf blade. Younger leaves show more severe mottling and chlorosis. Leaves completely turn yellow and gradually becomes necrotic Plants are stunted and flower and pod set is reduced Pod formation is reduced and if produced, they are deformed having shrivelled and undersized seeds Survival and spread P.I: Collateral hosts S.I: Whitefly, Bemisia tabaci Not transmitted by sap, seed and pollen Host range: French bean, Soybean, Red gram, Xanthium strumarum, Eclipta alba, etc. Management Remove collateral hosts and destroy Use resistant varieties Spray metasystox@0.1% for vector control 4) Common bean mosaic virus/ Green mosaic – Bean common mosaic virus (ss RNA) Symptoms Affects only beans (Phaeolus vulgaris & other Phaseolus species) Symptoms vary according to the variety of bean affected, time of infection and environmental conditions Leaves show mosaic pattern, i.e., light green areas alternate with dark green areas. Diseased leaves become rough, and show blisters on the leaf lamina Leaf size, petiole length and plant height reduced. Leaves curl downward Diseased plants produce fewer pods which are smaller in size Seeds become smaller, malformed and aborted Survival and spread Seed, sap, graft and aphid transmissible. Infected seeds are primary means of spread. 72
Aphis craccivora, Macrosiphum pisi, Aphis gossypi, A. medicaginis, Myzus persicae and Brevicoryne brassicae transmit the virus in a non-persistent manner Management Use of disease free seed Vector control with insecticides 73
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COURSE MATERIAL FOR PATH 372 DISEAS
Page 3 and 4:
Management Preventive measures: Se
Page 5 and 6:
Symptoms: The disease attacks leav
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Tristeza affected trees look chloro
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Symptoms: The disease starts with
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Spraying with Karathane 0.1% or cos
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1. Use of disease free planting mat
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The seedling radicle is negatively
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The finer roots show black streaks
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DISEASES OF PAPAYA Powdery mildew
Page 21 and 22: 4. Leaf curl: Tobacco leaf curl vir
Page 23 and 24: Management Removal and destruction
Page 25 and 26: Disease cycle P.I: Through disease
Page 27 and 28: 6) Banana Mosaic / Infectious chlor
Page 29 and 30: Management Spray carbendazim@0.1% o
Page 31 and 32: Cool dry weather Maximum temperatu
Page 33 and 34: 3. Anthracnose / Birds eye disease:
Page 35 and 36: 6. Rust: Phakopsora vitis GLR is co
Page 37 and 38: • Fruit set - 0.15% captafol 2) P
Page 39 and 40: Symptoms Small outgrowths on stem
Page 41 and 42: Severely infected leaves defoliate
Page 43 and 44: Tomato Spotted Wilt Virus. The dise
Page 45 and 46: 1) Little leaf - Phytoplasma LECTUR
Page 47 and 48: stage produces perithecia in which
Page 49 and 50: LECTURE 9 DISEASES OF POTATO 1) Lat
Page 51 and 52: Infected auxillary bud or the leaf
Page 53 and 54: Favourable conditions High soil te
Page 55 and 56: Also transmitted by pollen and seed
Page 57 and 58: Disease cycle P.I: Mycelium or con
Page 59 and 60: Management All collateral hosts in
Page 61 and 62: LECTURE 11 DISEASES OF CRUCIFERS 1)
Page 63 and 64: The fungus is seed borne and cause
Page 65 and 66: DISEASES OF CUCURBITS 1) Downy mild
Page 67 and 68: Disease cycle P.I: Collateral host
Page 69 and 70: 1) Purple blotch - Alternaria porri
Page 71: DISEASES OF BEANS 1) Anthracnose -
Page 75 and 76: Incorporate green manure crops like
Page 77 and 78: Provide proper drainage during rain
Page 79 and 80: As the disease advances the trunk g
Page 81 and 82: The centers of the spots eventually
Page 83 and 84: Disease cycle P.I: Infected plant
Page 85 and 86: Black minute pycnidia develop in th
Page 87 and 88: On stems, infected areas are blacke
Page 89 and 90: 1) Blotch - Septoria chrysanthemell
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PATH 372 Diseases of Horticultural Crops

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