Click on graphs for a larger version in a new window.
Information from Mary Hausbeck and Blair Harlan, Plant Pathology, Michigan State University http://www.ipm.msu.edu/grnhouse09/G02-02-09.htm#11
Current commercial horticultural information from the Cooperative Extension Office in Kent County Delaware, an outreach arm of the College of Agriculture and Natural Resources at the University of Delaware.
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