I don't over plan my garden and take the relaxing intuitive fun out it. These catepillars have attacked my grape leaves for the third year running. Dipel is one product containing bacillus thuringensis to be used with moderate success. Make sure the grape vines are in a sunny spot where they don't stay too wet. Add more soil amendments like fish emulsion so they will be less prone to attack.
Monsoon season brings humidity and mosquitoes to Southern Arizona.
I try to remember the moisture is well worth it. It's good to plant the Fall crops about the time when most of the insects start to hibernate. Ants here are hard to beat. I use tanglefoot around potted plants, but it's easy to get the goop on me. You need pot bottoms or the ants go in through the drainholes.