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Bob Morris

Bob Morris

Bob Morris is a horticulture expert living in Las Vegas and professor emeritus for the University of Nevada. Visit his blog at xtremehorticulture.blogspot.com. Send questions to Extremehort@aol.com.

Shade, water add up to make powdery mildew

Powdery mildew of grapes is also a problem if there is not enough air movement through the vine or past the bunches so they dry. It is best if the vine is growing in full sun.