PATH 372 Diseases of Horticultural Crops

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Grow resistant varieties like Banglore blue, Golden muscat, Golden queen and Isabella. 4. Alternaria leaf spot: Alternaria vitis Symptoms Appearance of patches mostly along the margin of leaves Individual spots appear rarely in the middle of the leaves In the initial stage, minute, yellow spots appear on the upper surface of leaves Later, spots enlarge and form brownish spots with concentric rings in them In severe cases of attack, leaves dry completely and defoliation occurs Mode of spread and survival Survives as mycelium or conidia in infected plant debris Spreads through air borne conidia Favourable conditions High humidity High rainfall and dew Heavy dosage of N2 fertilizers Management Destruction of crop debris Selection of disease free seed ST with mancozeb@2g/kg seed Foliar spray of mancozeb@0.25% 5. Bacterial leaf spot: Pseudomonas viticola First reported from S.V. Ag. College, Tirupati (1969 – 70). Anab-e shahi & Thomson seed less varieties are highly susceptible Symptoms Symptoms appear on foliage and twigs Initially yellowish, circular, translucent spots develop along the midrib and veins of leaves Necrotic areas along midrib & veins is the characteristic symptom Leaves turn yellow, shriveled and shed pre-maturely Disease cycle P.I: Mainly from infected twigs. Bacterium survives in the soil on plant debris. S.I Through wind splashed rain. Management Prune out and destroy infected plant debris Spraying antibiotics like streptomycin 100 ppm along with copper fungicides 34
6. Rust: Phakopsora vitis GLR is common throughout South-East Asia and other parts of the world. Cultivar Black prince is highly susceptible Symptoms The presence of clustered, small, yellow to orange, powdery spores on the underside of mature grapevine leaves. Small, dark spots also appear on the upper surface. Under severe infection, the entire leaf surface is covered by sori and premature defoliation occurs The disease eventually lead to weakening of the vine due to poor shoot growth Reduction in quantity and quality of fruit. Disease cycle P.I: Teliospores S.I: Uredospores GLR affects Vitis spp., including commercial and some ornamental grape varieties. It has also been found on native Ampelocissus species Management Spray zineb@0.2% or dust sulphur@25Kg/ha 35
Page 1 and 2: COURSE MATERIAL FOR PATH 372 DISEAS
Page 3 and 4: Management Preventive measures: Se
Page 5 and 6: Symptoms: The disease attacks leav
Page 7 and 8: Tristeza affected trees look chloro
Page 9 and 10: Symptoms: The disease starts with
Page 11 and 12: Spraying with Karathane 0.1% or cos
Page 13 and 14: 1. Use of disease free planting mat
Page 15 and 16: The seedling radicle is negatively
Page 17 and 18: The finer roots show black streaks
Page 19 and 20: 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: 3. Anthracnose / Birds eye disease:
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 and 72: DISEASES OF BEANS 1) Anthracnose -
Page 73 and 74: Aphis craccivora, Macrosiphum pisi,
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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