How many downy mildew sprays will need to be applied?
I hope that once we get past the next week or two, that we will learn that downy mildew is not widespread and is less of a threat than last year. If that is the case, then we may be able to increase the spray interval or go to a mancozeb only program to reduce costs, yet provide a measure of protection. However, we must be vigilant! My lab (517-355-4576) and Diagnostic Services (517-355-4536) on campus are available to look at any potential downy mildew samples. I can be reached via cell phone at 517-927-4532. See http://www.ipm.msu.edu/cat06veg/pdf/downymildew.pdf for results of last year’s downy mildew fungicide trial.
