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Hotwired, your Cuke beetle photo looks like the Striped Cucumber Beetle Acalymma vittata. A nasty pest not just cause it eats Cukes and other cucurbits. To make matters worse these beetles often harbor and transmit bacterial wilt, mosaic viruses, powdery mildew, and other such diseases to your plants.
Delaying cucurbit plantings until the last week of June and using heavy seeding rates can help assure that plant stands survive. Floating row covers can also be used to exclude the beetles from the plants, but must be removed by bloom to allow bees to pollinate the crop. Planting on black plastic mulch reduces the survival of this beetles’ larvae by up to 50%.
The tachinid fly, Celatoria diabrioticae, parasitizes both spotted and striped cucumber beetles, so maybe you can buy some tachinids and release them, or figure out what to interplant that will attract them.
Beneficial Nematodes (Steinernema riobravis) can provide partial control of SCB larvae.
Kaolin clay (Surround) is an organic insect repellent that suppresses light populations of cucumber beetles.
And the insecticidal soap will probably help, too!
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