Because of current weather conditions, both Downy mildew and Phytophthora are expected to affect cucumbers in Michigan.
“With the field report of downy mildew in Ontario, it is fully expected that the pathogen’s sporangia will be dispersed to Michigan’s growing regions. Our spore trap network has picked up three instances of downy mildew in air samples.”
“Earlier this growing season when field conditions were dry, Phytophthora capsici crown rot was not expected. This situation has now taken a dramatic turn as the recent heavy rains, saturated soils, and high relative humidity have literally created a perfect storm for Phytophthora development and crop destruction.”