PATH 372 Diseases of Horticultural Crops
PATH 372 Diseases of Horticultural Crops
PATH 372 Diseases of Horticultural Crops
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Infection restricts flowering and fruits are not formed, if formed, turns smaller,<br />
harder and rough. Loss in fruit yield ranges from 50-100% based on disease<br />
incidence<br />
Disease cycle<br />
P.I: Infected plant parts<br />
S.I: The virus is transmitted by the whitefly, Bemisia tabaci.<br />
Management<br />
Tolerant varieties: Parbhani Kranti, Pusa savani, Janardhan, Haritha, Arka<br />
Anamika and Arka Abhay<br />
The disease spread can be restricted by spraying Monocrotophos, 1.5 ml/l.<br />
2) Cercospora leaf spot: Cercospora malayensis, C. abelmoschi<br />
C. malayensis causes brown, irregular spots and C. abelmoschi causes sooty<br />
black, angular spots on lower surface <strong>of</strong> leaves<br />
Both the leaf spots cause severe defoliation and are common during humid season.<br />
Disease cycle<br />
P.I: The fungi survive through conidia and stromata on crop refuse in soil.<br />
S.I: Air borne conidia<br />
Management<br />
Spray mancozeb or zineb@0.2% or carbendazim@0.1% for disease control a<br />
month after sowing and repeat at fortnightly intervals based on disease incidence.<br />
3) Powdery mildew: Erysiphe cichoracearum<br />
Symptoms<br />
Grayish powdery growth occurs on the under as well as on the upper surface <strong>of</strong> the<br />
leaf causing severe reduction in fruit yield.<br />
Management<br />
Dust finely ground sulphur at 30 kg/ha or spray wettable sulphur@0.3% or<br />
Dinocap@0.1% , three to four times at 15 days intervals.<br />
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