Q.Plant Disease
Do plant diseases such as rust, black spot, powdery mildew, and blight affect all areas of the United States? When are these diseases active?

Nikki
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on March 14, 2011
Yes, all of those named do affect all over the US. Mostly they are seen while plants are growing outside, but a few, like powdery mildew, can be seen on houseplants year round.
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