PATH 372 Diseases of Horticultural Crops

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3) Fusarium wilt – Fusarium oxysporum f.sp. chrysanthemi Symptoms Disease is characterized by chlorosis of one or more leaves Drooping of leaves and wilting of the affected plants Black necrotic spots appear on the stem Vascular discolouration Creamy mycelial growth of the pathogen is seen on the collar region under humid conditions Survival and spread P.I: Soil borne fungus or through cuttings S.I: Conidia dispersed through irrigation water Management Cuttings should be obtained from disease free plants Long crop rotation 1) Wilt – Fusarium solani DISEASES OF CROSSANDRA Symptoms Usually observed one month after transplanting in patches Leaves of infected plants become pale and droop Leaf margins show pinkish brown discolouration Discolouration spreads to midrib in 7 to 10 days Stem portion gets shrivelled Dark lesions noticed on the roots extending upto collar region which results in sloughing of cortical tissue Disease cycle P.I: Chlamydospores survive in soil S.I: Microconidia dispersed through irrigation water Favourable conditions Incidence is more in presence of root lesion nematode, Pratylenchus sp., and Helicotylenchus dihystera Management Remove and destroy affected plants Soil application of phorate @1g/plant on 10 th day of transplanting for nematode management Soil drench with Carbendazim@0.1% or COC@0.25%. Repeat soil drenching after 3-4 weeks 90
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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
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• 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: 1) Blotch - Septoria chrysanthemell
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PATH 372 Diseases of Horticultural Crops

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