Frankly I would starve before using Sevin.
Let your chickens forage in the garden on the off season to eat the larvae.
Choose seed that the insects like less. I love Rumbo squash for this reason. I grow it on a fence to keep the vines off the soil.
Plant consecutively. One crop should be off of the insect's cycle. Do not use leaf mulch around squash. Squash bugs hide in it.
I use Rotenone which is effective and organic. Pyrethrum is good also. Last year was the first year in a long time that I used an insecticide because of striped cucumber beetles.
Try bug juice. Catch the offending bug, mix with dish soap and water, blend in an old blender, let sit for a few days, strain, and spray on the plants.
Floating row covers are supposed to help though I have not used them in a long time.
Plant radish seeds near each plant and leave one to go to seed.
Plant an early trap crop outside of your garden to attract insects. Pull and burn if you see pests.
Rotate your crops.
The organic mantra is healthy soil makes healthy plants that do not attract pests.
I have had the most success since the chickens have been in the garden winters.The next most important thing is consecutive planting.