Remove old fruit to allow new fruit to develop. Check plants daily once they begin to bear. In certain years, they may attack squash in large numbers and stunt or kill the small plants. The overwintering beetles carry bacterial wilt disease and spread it to the plants when they feed. Control cucumber beetles by applying a suggested insecticide.
Squash bugs can be a problem on older squash 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. As they reach the adult stage, squash bugs are nearly impossible to control. Flea beetles are small, black beetles about the size of a large pinhead. They eat numerous small holes in the leaves.