Phytophthora fruit rot often reaches a peak in late summer and early fall as winter squash and pumpkins mature.
MSU Extension
The Michigan State University Vegetable Pathology Lab reports cucurbit disease outbreaks and control measures for these pathogens. County Extension Agents from across the state of Michigan publish bi-weekly crop updates including disease incidents and control measures throughout the growing season.
Michigan Cucurbit update | August 21, 2024
Powdery mildew, Plectosporium blight, and Phytophthora fruit rot are present in the late summer and early fall as winter squash and pumpkins mature.
Michigan Cucurbit update | August 14, 2024
Cucurbit crops are being harvested, pumpkins are sizing as powdery mildew settles in across the state. Plectosporium blight can also be found. Stay vigilant against downy mildew and Phytophthora pathogens.
Downy mildew and Phytophthora threaten Michigan Cucurbits
Cucurbit crops, excluding pumpkins, are being harvested, with vigilance against downy mildew and Phytophthora pathogens. Downy mildew has been confirmed in 13 Michigan counties, affecting cucumber and melon crops. Phytophthora symptoms are expected to increase following recent rains, impacting plant crowns and fruit.
Risk of CDM infection in Michigan cucumbers
Clade 2 downy mildew reported in Michigan
Cucurbit downy mildew was recently detected on cucumbers in Michigan. The pathogen has also been detected in spore traps in multiple locations across the state.
Downy mildew reported on cucurbits in Michigan
All Michigan cucumber and melon growers should employ effective downy mildew fungicides immediately.
Michigan Cucurbit update | June 26, 2024
Cucurbit Downy mildew spores have been detected in Michigan. Squash vine borers are active. Cucamelon (Melothria scaba), an obscure cucurbit crop has gained popularity.
