PATH 372 Diseases of Horticultural Crops
PATH 372 Diseases of Horticultural Crops
PATH 372 Diseases of Horticultural Crops
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6. Rust: Phakopsora vitis<br />
GLR is common throughout South-East Asia and other parts <strong>of</strong> the world. Cultivar<br />
Black prince is highly susceptible<br />
Symptoms<br />
The presence <strong>of</strong> clustered, small, yellow to orange, powdery spores on the<br />
underside <strong>of</strong> mature grapevine leaves. Small, dark spots also appear on the upper<br />
surface.<br />
Under severe infection, the entire leaf surface is covered by sori and premature<br />
defoliation occurs<br />
The disease eventually lead to weakening <strong>of</strong> the vine due to poor shoot growth<br />
Reduction in quantity and quality <strong>of</strong> fruit.<br />
Disease cycle<br />
P.I: Teliospores<br />
S.I: Uredospores<br />
GLR affects Vitis spp., including commercial and some ornamental grape varieties.<br />
It has also been found on native Ampelocissus species<br />
Management<br />
Spray zineb@0.2% or dust sulphur@25Kg/ha<br />
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