I haven't had cucumber beetle problems in years, Mid-Atlantic, Zone 7. Few pests on my peppers or tomatoes, either. I TOTALLY stopped using ANY sprays, powders, soaps, etc. several years ago. Pest controls, organic or chemical, just damage the soil infrastructure and organisms, and weakens your plants. Concentrate on making cold
compost (grass, leaves, veggies), and
feed your soil, not your plants. Let nature's beneficial soil organisms crowd out the pathogens. If you have pests, it means you have failed in your soil. Applying pallative measures to sick plants just makes sick fruit. An occasional pest is important, because that is food for your plant protectors. Killing all the pests starves your plant protectors, which will then leave. It is all about balance. Also, don't
fence out your bees and moths. While parthenocarpic plants will make fruits without pollination, they won't make many. Plant two varieties of cucumbers (parthenocarpic if you wish), and some nearby flowers to draw pollinators, and you will have many more cucumbers. I know how aggravating it is to watch pests destroy your
gardening efforts, but don't react by attempting to destroy the pests. Go work on your composting, and very soon, nature will protect your garden. It's way more fun that fighting pests. Healthy soil makes healthy plants, and healthy plants don't have many pests.
Books by Jeff Lowenfels and Eliot Coleman will change your
gardening life.