Cercospora leaf spot of chrysanthemum

Symptoms
Symptoms first appear as yellow spots which turn brown to black. Spots often occur on lower leaves first and can coalesce into large necrotic areas and finally death of the entire leaf.

Control
Regularly clean up and destroy infected plant debris and hand pick symptomatic leaves from lightly infested plants. Avoid splashing water onto plant foliage and water early in the day to allow foliage to dry quickly. In severe cases, applications of fungicides with the active ingredients chlorothalonil, mancozeb, myclobutanil, propiconazole, or thiophanate methyl may be applied according to label instructions.