![]() ![]() Quentin Tyler, Director, MSU Extension, East Lansing, MI 48824. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. ![]() Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. Early blight can be adequately controlled by relatively few fungicide applications if the initial application is properly timed.Īlthough no late blight has been found in potatoes since early 2013 in Florida, there was a recent report on June 7 of late blight from Tennessee on tomatoes, although the genotype has not yet been reported. Current recommendations for fungicides for late blight, early blight and brown leaf spot can be found in the Michigan State University Extension bulletin E312, “ Insect, Disease and Nematode Control for Commercial Vegetables” on page 114.Įarly season applications of fungicides before secondary inoculum is produced often have minimal or no effect on the spread of early blight. Some areas have reached DSV = 18 and programs should be started if growers have not already done so and P-values are approaching 300 in some areas also. Early blight protection programs should be initiated at P-value = 300. Our general recommendations for initiating late blight crop protection programs are when DSV values accumulate to 18. However, this is not available for P-value accumulations. It is possible to accumulate late blight risk based on emergence date by choosing your own emergence date. The accumulations were initiated on May 1 and for many parts of the state, potatoes were only planted mid- to late May. These are updated daily and stations across the state can be compared at the Late Blight Risk Monitoring website. As of Monday, June 10, 2013, there is great variability in the disease risk severity accumulations for both late blight and early blight (P-values) across Michigan. ![]()
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