Asked July 3, 2019, 8:23 PM EDT

Hi! Do I have a rust problem going on here? When I rubbed it on white paper, it was a pale orange color. Thank you!

Oakland County Michigan

1 Response


This could be anthracnose or rust, a problem this year with the wet spring weather. Keep damaged foliage cleaned up and discarded, water from below, and redirect lawn sprinklers so leaves stay dry. Applying chlorothalonil or copper- based fungicides are effective at protecting clean buds and foliage from both rust and anthracnose. Here are descriptions of leaf spot diseases-

The “windowing” at the edge looks like insect damage. To accurately diagnose which fungal issue it is, leaves need a look under magnification. You can submit samples to

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