Downy mildew (DM) is an important disease of cucumber and other cucurbits. Many quantitative trait loci (QTL) have been identified from different resistant resources but very few have been fine mapped or cloned. CucCAP researchers in USDA-ARS and the University of Wisconsin Madison reported identification and functional characterization of the candidate gene for the major-effect QTL, dm5.3, for DM resistance from the plant introduction line PI 197088. This gene, which can enhance plant disease signaling, is currently being used to breed for disease resistance in cucumber.
Cucurbit Downy Mildew
Pennsylvania Vegetable Disease Update
Downy mildew on jack-o-lantern pumpkin was reported for the region. Downy mildew has also been reported on summer squash in New Jersey and watermelon on Long Island, NY. These hosts are primarily affected by clade 1 isolates of cucurbit downy mildew. Before this, downy mildew has primarily been affecting cucumber and cantaloupe, which are largely affected by clade 2 isolates.
Cucurbit Downy Mildew updates September 2022 | ipmPIPE
Epidemic Status of cucurbit downy mildew (Pseudoperonospora cubensis) displayed on the website map for 9-22-2022 on all Cucurbit hosts. Disease observations on cucumber, squash, and pumpkin were reported in the previous seven days.
Watermelon Downy Mildew Alert
Michigan vegetable report | August 2022
Powdery mildew was reported on pumpkins and hard squash across the state. Downy mildew spores have been detected in all spore traps in the state’s network.
Cucurbit Disease Treatment Options
Growers have several effective chemical treatment options available for gummy stem blight and downy mildew control.
Cucurbit Downy Mildew updates August 2022 | ipmPIPE
The Cucurbit downy mildew forecast reports disease incidents from multiple locations in the United States. Website visitors have the option to receive alerts via email for a specific location.
Cucurbit Downy Mildew updates July 2022 | ipmPIPE
The Cucurbit downy mildew forecast reports disease incidents from multiple locations in the United States. Website visitors have the option to receive alerts via email for a specific location.
