Downy mildew12/2/2023 ![]() A compound microscope is used to identify any downy mildew spores that are present on the tapes. These spores become imbedded on a sticky film that is removed and taken to the laboratory. In May 2014, spore traps were placed in Monroe, Saginaw and Bay counties, and they continuously sample the air and collect spores into the trap. To help growers determine the level of downy mildew threat, a monitoring system has been in place for Michigan since 2006. The spores travel on air currents from areas where it can overwinter (i.e., southern areas of the United States or protected cucumber production greenhouses) into Michigan each growing season. It reproduces via tiny, microscopic spores that act as seeds of the pathogen. The downy mildew pathogen does not overwinter in Michigan or nearby states. There have been outbreaks in Florida, North Carolina and South Carolina. There are no confirmed occurrences of cucurbit downy mildew in Michigan or nearby states. With spore detection and the favorable environmental conditions for downy mildew that we’ve had this summer, Michigan State University Extension suggests a fungicide program take place for cucumbers. This was the only day in June with relatively high spore counts. Downy mildew spores detectedĪ significant number of airborne downy mildew spores were detected on Jin the pickle-growing region of Bay County. Results from our research have identified a limited number of fungicides that are effective, but must be applied every five to seven days to control downy mildew on cucumbers when weather favors disease (Table 1). This downy mildew pathogen is resistant to commonly used fungicides including Ridomil Gold-based products and the strobilurin fungicides (i.e., Cabrio, Quadris and Flint). ![]() Resistant cultivars are not currently available and fungicides have been the only effective means of controlling this disease. Michigan cucumber and pickle growers have battled downy mildew, incited by the water mold, Pseudoperonospora cubensis, since 2005. ![]()
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