PATH 372 Diseases of Horticultural Crops
PATH 372 Diseases of Horticultural Crops
PATH 372 Diseases of Horticultural Crops
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LECTURE 12<br />
DISEASES OF BETELVINE<br />
1) Wilt – (Phytophthora, Sclerotium and Fusarium)<br />
Symptoms<br />
Sclerotium<br />
Collar region is usually infected<br />
White mycelial growth over the infected area <strong>of</strong> stem on which small mustard seed<br />
like sclerotia appear<br />
Shredding <strong>of</strong> infected bark<br />
Vine wilts and totally dries <strong>of</strong>f<br />
Phytophthora parasitica<br />
The disease is characterized by darkening <strong>of</strong> basal stem. Soon the wine wilts<br />
accompanied by yellowing <strong>of</strong> leaves and drooping <strong>of</strong> vines, starting from tip<br />
downwards.<br />
Infection from soil level spread upwards reaching 2 nd or 3 rd internode.<br />
Roots <strong>of</strong> affected plants are discoloured, rotted, starting from smaller roots and<br />
spreading to the stem<br />
Management<br />
Destruction <strong>of</strong> dead vines<br />
Long crop rotation with non hosts<br />
Deep summer ploughing<br />
Green manuring before planting<br />
Application <strong>of</strong> Trichoderma viride, 2kg mixed in 50 kg <strong>of</strong> FYM<br />
Drench the soil with 1% BM<br />
2) Anthracnose/Leaf spot/Marginal blight: Colletotrichum capsici<br />
Symptoms<br />
Light to dark brown irregular spots on leaves surrounded by diffuse chlorotic halo<br />
Marginal leaf tissue becomes black, necrotic and gradually spreads towards the<br />
centre<br />
Circular, black lesions may girdle the stem culminating in death <strong>of</strong> the vine<br />
Management<br />
Spray 1% BM or COC@0.3% at 15 days interval<br />
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