“Downy mildew continues to infect cucumber plantings. Powdery mildew and gummy stem blight are starting to show up in hard squashes.”
“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.”
Michigan Extension agents and vegetable specialists report on pickling cucumbers, butternut squash, pumpkins and acorn squash this week and make recomendations for downy mildew control.
Michigan Extension agents and specialists report on pumpkin and squash crops in the first week of July 2021 and recommend control measures for squash vine boarers and cucumber beatles.
The recent overcast, humid, and wet conditions ensure that the sporangia will survive being transported via air currents from a diseased field to healthy cucumbers.
Transplanting has been underway across the state. Some early melons under vented plastic tunnels were exhibiting some symptoms that are hard to diagnose. Producing crops at the fringes of the season may result in symptoms caused by freeze damage in the field or heat stress in tunnels.
Transplanting of warm-season vegetables is set to ramp up at the end of this week in some areas, and direct-seeding continues. Cucumber, melon and squash transplants were between cotyledon and four true leaves in 50- and 72-cell transplant trays this week in Bay County, Michigan.
East, Southeast, and Southwest Michigan Cooperative Extension agents reported on crop production of zucchini squash, yellow squash, pumpkins, winter squashes, and cantaloupe. Powdery mildew arrived late this year, making management easier.