High squash bug populations can literally drain plants causing them to die and wilt. Reduced yields and poor quality fruit may result from squash bug feeding activities. Squash varieties resistant to squash bugs include Butternut, Royal Acorn, and Sweet Cheese. Effective control of squash bugs is contingent upon timely insecticide sprays coupled with thorough coverage. Observe plantings for the presence of adult bugs and scout fields for egg masses on the undersides of leaves.
Eggs get darker in color just before hatching.
Treat when most eggs have hatched and when nymphs are still small to medium in size. Placing pieces of board or shingles on the ground near the plants concentrates these insects in a small area that is more easily treated. Adult squash bugs have a hard, protective shell which is impervious to insecticide treatments. Use high pressure when applying insecticides to ensure penetration of the dense plant foliage and thorough coverage to the nymphs which often are on the undersides of leaves. Subsequent treatments are usually required due to the continual presence of egglaying squash bugs.