we are a little late according to this article but better late than never….
Squash Bug Control
Weather conditions appear to be very important in the severity of squash bug problems. Warm temperatures during the growing season allow most of the second generation nymphs to successfully reach the adult stage. Mild winter temperatures allow the overwintering adult bugs to survive from season to season. Early stage squash bugs at egg hatch.
In small plantings, hand-picking can be very effective. Attention should be given to the eggs which are easily detected in garden surveys and can be crushed when detected. Egg surveys should be done at least once a week during June when egg laying is likely to begin.
Since squash bugs often seek shelter around the base of plants, this area should be cleared of debris. Mulches often provide protective cover for squash bugs and damage can be worse on plants that are mulched compared to those grown over bare soil. The area around the base of the plant is also a site where insecticide applications should be concentrated. Diatomaceous earth/pyrethrins applications around the base of the plant can be an effective method to control squash bug and is a treatment allowed in Certified Organic vegetable production.
A few other insecticides, including those with esfenvalerate, permethrin, or carbaryl as the active ingredient, can also control squash bug. It is recommended that these treatments be applied early in the season. A first application should be made when eggs are first detected (i.e., June) followed by a second application a week or two later to provide excellent early season control on young plants. This early season management approach has several further advantages. For one, applications are made well before harvest, allowing insecticide residues to greatly degrade and diminish. Also, it reduces early population growth numbers that are available to lay eggs during the second generation later in the season.