Last summer, my zucchini plants were devastated by 0. 5-inch long black beetles. These beasts eat all the leaves, and the plants could, of course, not perform photosynthesis and died without producing anything. I try to keep my garden as organic as possible, but I am willing to try everything to get rid of these killer beetles.
Certified GKH Gardening Expert
You may want to try neem oil on your plants. Not only is it effective against many insect pests, but it's also safe. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm