Cucumber Anthracnose Reported in North Carolina
Leaves infected with cucurbit anthracnose, caused by Colletotrichum orbiculare, were submitted to the NCSU Vegetable Pathology Lab and confirmed as positive.
Anthracnose can be confused with other foliar cucurbit diseases, such as cucurbit downy mildew, but chemical control is drastically different for different cucurbit diseases. If you think you have cucurbit anthracnose, please contact your local Extension Agent and send photos and/or physical samples to the Plant Disease and Insect Clinic. It is critical to determine which disease you have before spraying your crop to ensure you are applying effective products for that particular disease.
See information regarding identification and control of cucurbit anthracnose in our fact sheet. According to demonstration trials we conduct annually, several products are effective for anthracnose control. Growers are recommended to scout for the disease since wet and warm conditions favor anthracnose. An effective fungicide should be applied every 7 to 14 days, especially if conditions continue to be favorable, to prevent defoliation.