Carefully split open the stem and remove the grub, or spray bacillus thuringensis directly into the stem with a needle and syringe. The base of the stems get a chewed appearance, and soon after, the plants wilt and die. Prevent bacterial wilt by strictly controlling the insects by using a row cover or hand picking. If you use row covers, be sure to remove them before the plants flower to ensure pollination. Rewove any diseased plants immediately and burn.
Cucumber beetles feed on young plants and can also spread disease.
They look like yellow lady bugs with either black spots or stripes. Make sure you wash your hands after handling diseased plants, you can spread the problem too. Companion Plants such as radish, marigold and tansy contain substances which repel and confuse insects looking for a preferred food. The speed at which the squash grows is legendary. Unless you are really into zucchini bread, a few plats should supply your family.