PATH 372 Diseases of Horticultural Crops

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1) Rust – Uromyces hobsonii DISEASES OF JASMINE Symptoms Leaves, stems and inflorescence are affected Blisters or tumors and other abnormalities may be produced on the infected plant parts Infected portions become hypertrophied Orange coloured pustules on both surfaces of leaf but predominantly on lower surface Chlorosis & defoliation of leaves under severe conditions Yellow or orange coloured cankers on stems and twigs Splitting of bark of affected branches and subsequent death of branches Infected flower buds are swollen and deformed Flower production is highly reduced Disease cycle P.I: Teliospores in infected plant S.I: Wind borne aeciospores Pathogen Autoecious rust (Demicyclic rust/ Opsis rust) Uredial stage is absent Pustules are initially yellow (aeciospores) and later turn dark (teliospores) Favourable conditions Rust initiates in June- July and persists till March Management Remove and destroy affected plants or plant parts to avoid further spread. Spray Oxy-carboxin (plantavax) or Mancozeb @0.2% Dust sulphur (20-25kg/ha) or spray tridemorph (0.05%) or triadimefon (Bayleton) @ 0.05% 2) Cercospora leaf spot – Cercospora jasminicola Symptoms Conspicuous, circular to irregular, reddish brown spots with a darker border and whitish centers appear on both the leaf surfaces and other aerial parts of the plant Severe infection results in defoliation and die back symptoms Flowering is adversely affected Management Spray carbendazim@0.1% or COC@0.3% Monthly sprays of Benomyl or thiophanate methyl @0.1% Collect and burn diseased plant debris Pari Mullai is moderately resistant 88
1) Blotch – Septoria chrysanthemella DISEASES OF CHRYSANTHEMUM Symptoms Blackish brown circular to irregular spots on leaves which later form large patches covering major portion of the leaf Patches are surrounded by chlorotic halo Later the centers turn greyish and the leaves remain small and curl Dead leaves hang on stem for some time Dead leaves hang on stem for some time Survival and spread P.I: Infected plant debris in soil S.I: Wind borne conidia Management Collect and burn diseased plant material Spray carbendazim@0.1% Tolerant varieties: Alpana, Sarad and flirt 2) Chrysanthemum stunt - Viroid Symptoms Small plants with paler plants and flowers Some flowers appear bleached and are inferior in quality Flowers from diseased plants open 7 t0 10 days earlier than healthy ones Axillary buds grow prematurely and produce number of branches and stolons and plants are stunted in appearance White specks and yellow blotches appear on leaves of some varieties Cuttings from diseased plants root poorly Survival and spread P.I: Viroid survives in infected plants S.I: Spread through sap and knives or tools used during pruning or pinching plants, taking cuttings and cutting the flowers Management Use certified Viroid free stocks Remove and destroy infected plants 89
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COURSE MATERIAL FOR PATH 372 DISEAS
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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:
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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 and 86: Black minute pycnidia develop in th
Page 87: On stems, infected areas are blacke
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PATH 372 Diseases of Horticultural Crops

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