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AVRDC
International Cooperators'
Fact Sheet |
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Cucurbit Diseases Corynespora Leaf Spot Corynespora cassiicola Found in tropical and subtropical areas |
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Damage Symptoms The fungal disease is most damaging to cucumber and cantaloupe but may occur on other cucurbits. Lesions on leaves begin as small, watersoaked spots delimited by small veins, but soon enlarge to form large, circular, sometimes zonate spots that range from tan to dark brown in color. As the spots enlarge, the entire leaf turns yellow and dies. Fruit are not attacked. |
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Conditions for Development Extended periods of rainfall
and warm temperatures favor disease development. The fungus survives
in crop debris or on weeds and other crops. It has a very wide
host range. Spores are moved by wind and rain splash. Disease
development is favored by high moisture conditions brought on
by extended periods of rainfall and poor drying conditions. It
can be a serious disease in glasshouse crops. Some cultivars are less affected than others and should be used when available. A fungicidal spray program is likely to be needed if the crop is grown under conditions conducive to disease development. Glasshouse should be decontaminated with a sterilant between crops and good ventilation should be maintained to keep the humidity low during the cropping season. |
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Last updated: 2001. Information from: Vegetable Diseases: A Practical Guide. Lowell L. Black, AVRDC. |
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