Perfect conditions for Cercospora

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Be on the lookout for Cercospora leaf spot in your landscape plants! Recent weather conditions around the state like cool temperatures and high humidity seem to trigger an increase in Cercospora activity. Check your colorful fall annual bedding plants, including zinnias, hydrangeas, snapdragons and azaleas, for necrotic or purplish, angular leaf spots.

A: Cercospora symptoms on a recent Pansy sample

B: Conidiophores on leaf edge

C: Cluster of Cercospora conidiophores


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