PATH 372 Diseases of Horticultural Crops

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Bark on younger branches becomes darkened and water-soaked. At advanced stages, cracks will develop in the bark, and the surface will be sunken slightly. Wood under the bark will show streaked discolorations. Similar symptoms can be observed in infected apple rootstocks Infected small immature fruit becomes water soaked, then turn brown, shrivel, turn black and cling to the tree for several months after infection Droplets of milky coloured, sticky ooze may appear on infected parts which usually turns brown on exposure to air Survival and spread The bacteria overwinter at the margins of the cankers and possibly in buds and apparently healthy woody tissue Insects such as bees, flies and ants spread the bacteria to the flowers Management During winter prune out and burn blighted twigs, branches and cankers, and even whole trees, at about 30cm below the point of visible infection Disinfect the tools after each cut with 10% sodium hypochlorite Insect control Resistant varieties Dormant sprays with copper sulphate or bordeaux mixture, however, bordeaux mixture or streptomycin are the only effective blossom sprays 4) Crown gall – Agrobacterium tumefaciens 38
Symptoms Small outgrowths on stem and roots near soil line Galls are spherical, white or flesh coloured (young stage) Galls become hard and corky on woody stems, knobby and knotty Affected plants stunted with chlorotic leaves Management Regulatory measures Crop rotation with maize or other grain crops Avoid injuries to roots or lower stem parts Penicillin or vancomycin - partial control Agrobacterium radiobacter (Strain K1026) (No gall) applied to fresh wounds. 39
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 and 34: 3. Anthracnose / Birds eye disease:
Page 35 and 36: 6. Rust: Phakopsora vitis GLR is co
Page 37: • Fruit set - 0.15% captafol 2) P
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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