Matthew is evaluating fungicide sensitivity of CDM to single fungicide products and efficacy of forecasters in controlling CDM and spore trapping of P. cubensis using impaction spore traps.
New reports of CDM on butternut squash, acorn squash, pumpkin, zucchini, summer squash and cucumber.
New reports of CDM on pumpkin, cantaloupe, cucumber, and butternut squash, in the southeast, northeast, and midwest.
Recent outbreaks of CDM for the period from July 21, 2021 to August 18, 2021.
Currently, both clade 1 and clade 2 have arrived in North Carolina through air currents.
“A spray interval of five days is recommended when weather is favorable for disease. This shorter interval should not be an issue if the recommended fungicides are used in alternation.”
Leaves showed symptoms typical of CDM: angular, chlorotic or yellow lesions on the upper surface of the leaves with gray to black spores on the underside of the leaf.
Downy mildew confirmed on cucumbers in four Michigan counties