Remove old fruit from the vines so the young fruit will develop. The cucumber fruit grows rapidly to harvest size and should be picked every other day. They may attack in large numbers and can stunt or kill the small plants. The beetles may also carry bacterial wilt disease. Control cucumber beetles by applying a suggested insecticide.
Squash bugs can be a problem on older cucumber plants.
They can cause considerable damage to the foliage and may even strip the plant of leaves. These insects are easy to control when they are young in the nymph stage but nearly impossible when adults. Flea beetles are small, black beetles about the size of a large pinhead. They eat numerous small holes in the leaves and tend to be more of a problem on young plants. Watch for buildup of colonies of aphids on the underside of the leaves.