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Cercospora leaf spot of clematis

Sep 9, 2013 6:48 AM

Fungal causal agent: Cercospora squalidula

Symptoms: Large circular lesions with a light brown center is the key symptom on clematis.

Management:. Irrigation management by reducing high moisture on leave is a key component in addition to sufficient air circulation. Preventative fungicide applications are necessary in high intensity production areas. Apply fungicides early in the spring to cover previous years growth to reduce inoculum load. Check http://premier.cdms.net/webapls/formsloginRef.asp?/webapls for current labels in ornamental production.