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Credit
for information used:
- Maryland
Cooperative Extension, Fact Sheet 454
.
- Bob Rouse-
University of Maryland Regional Fruit and Vegetable Specialist
.
- Charles McClurg-
Extension Vegetable Specialist University of Maryland
 .
- Alan McNab- Penn
State Univ. Extension Plant Pathologist
.
- Ron Morse-
Virginia Polytechnic Institute and University, Vegetable Crop
Specialist
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