PATH 372 Diseases of Horticultural Crops

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6) White rust – Albugo candida (Syn: Cystopus candidus) Symptoms White, shiny raised blisters (pustules) on the lower surfaces of leaves, stems & flowers. Pustules coalesce to form irregular patches The epidermis ruptures exposing white spore mass which gives the pustule a powdery appearance Distortion of the floral parts including petals, pistils and anthers due to hypertrophy and hyperplasia Plants malformed beyond recognition Disease cycle P.I: Oospores in soil and Perennial weeds hosts S.I: Sporangia & Oospores carried by wind Management Sanitary measures Crop rotation Destruction of weeds Spray 0.8% B.M or any copper fungicide 64
DISEASES OF CUCURBITS 1) Downy mildew – Pseudoperonospora cubensis Host range: Musk melon, Sponge gourd and Bitter gourd etc. Symptoms Yellow, angular spots appear on upper surface of leaves The corresponding lower surface of these spots shows a purplish downy growth in moist weather The spots turn necrotic with age The diseased leaves become yellow and fall down Diseased plants get stunted and die Fruits produced may not mature and have a poor taste Disease cycle P.I: Collateral hosts or fungus surviving in plant debris S.I: Wind borne sporangia or splashing rain water Management Destruction of cucurbitaceous weeds around field Spray metalaxyl@0.2% or chlorothalonil@0.2% Spray zineb@0.3% at 10 days interval 2) Powdery mildew: Erysiphe cichoracearum, Sphaerotheca fuligena Host range: Pumpkins, bottle gourd, Coccinia, cucumber, ridge gourd Bitter gourd is less effected Symptoms Whitish or dirty grey, tiny powdery growth on foliage, stems and young growing parts The superficial growth ultimately covers the entire leaf area The diseased areas turn brown and dry. This leads to premature defoliation and death Fruits remain undeveloped and are deformed 65
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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
Page 7 and 8:
Tristeza affected trees look chloro
Page 9 and 10:
Symptoms: The disease starts with
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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 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: The fungus is seed borne and cause
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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