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.
Bob Morris
![Bob Morris](https://www.reviewjournal.com/wp-content/uploads/2017/04/bob_morris_980x550_040417eb_001.jpg?w=900&h=550&crop=1)
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.
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