PATH 372 Diseases of Horticultural Crops

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LECTURE 16 DISEASES OF MULBERRY 1) Powdery mildew – Phyllactinia guttata, P. corylea, P. suffulata Symptoms Lesions appear as whitish patches on the lower surface of the leaves Gradually they turn yellowish brown to black patches Powdery patches cover the entire leaf surface which is unsuitable for feeding the silk worms The whitish powdery material seen on the leaves consists of the fungal hyphae, conidia, conidiophores and cleistothecia Survival and spread Mycelium or cleistothecia in infected plant debris Wind borne conidia Management Remove and destroy infected plant debris Spray wettable sulphur@0.2% or Dinocap@0.1% Waiting period of 15 days after spray may be allowed before harvesting the leaves DISEASES OF ROSE 1) Powdery mildew – Sphaerotheca pannosa var. rosae Symptoms The infected leaves show grayish powdery fungal growth Rolling of leaf margins with the onset of sprouting season Affected leaves become curled and distorted Badly infected flower buds fail to open Infected floral parts become discoloured, dwarfed and dried Survival and spread P.I: Mycelium in dormant buds and shoots or as cleistothecia S.I: Wind borne conidia Management Collect and destroy infected plant debris Four sprays with wettable S@0.3% or carbendazim@0.1% or Dinocap@0.1% at 10 days interval Resistant varieties: Ashwini, Ambika, Angeles, American pride, Surabhi 2) Black spot – Diplocarpan rosae (Anamorph: Marssonina rosae) Symptoms Dark brown tar coloured spots with fringed borders Spots coalesce forming large patches Infected leaves turn brown and defoliate Fungus may also attack stems and flowers of rose bushes 86
On stems, infected areas are blackened with blistered appearance dotted with pustules Survival and spread Pycnidia or ascospores in infected plant debris Wind borne conidia Management Affected parts should be collected and destroyed Spray Tridemorph @0.025% or benomyl @0.1% at weekly intervals starting with the sprouting of the plants till new foliage appears. Shade and extensive irrigation should be avoided. Resistant varieties: Bebe bune, coronado ,Grand opera, sphinx. Radiance - escape infection due to waxy surface 3) Die-back – Diplodia rosarum Symptoms Infection starts from the pruned surface of the twigs. The infected portion become brown to dark brown or black Infected twig dries from tip downwards Infection spreads from twig to main stem and roots and finally whole plant is killed Older plants and neglected bushes are more frequently attacked Survival and spread Pycnidia present in dead twigs Conidia through irrigation water Management Diseased twigs should be carefully removed and destroyed After pruning the cut end should be protected with chaubattia paste Spray Difolatan@0.2% or mancozeb@0.2% or Chlorothalonil@0.2% in early September and late October Resistant varieties: Blue moon, Red gold, Summer queen, etc. 87
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COURSE MATERIAL FOR PATH 372 DISEAS
Page 3 and 4:
Management Preventive measures: Se
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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
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4. Leaf curl: Tobacco leaf curl vir
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Management Removal and destruction
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Disease cycle P.I: Through disease
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6) Banana Mosaic / Infectious chlor
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Management Spray carbendazim@0.1% o
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Cool dry weather Maximum temperatu
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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 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: Black minute pycnidia develop in th
Page 89 and 90: 1) Blotch - Septoria chrysanthemell
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PATH 372 Diseases of Horticultural Crops

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