Spinosad (Montery) can be part of your IPM.
I switch up cause I get mites from time to time and they can get resistant to just 1 product.
I doubt they will resist spinosad tho I just switch up to make me feel better.
Montery should be used as a preventative in your IPM. I use 1 tbs to a gal of water and add in the other ingredients and foliar on.
@Nunyabiz has a great point to use natural predators. He's likely running in large containers with established cover/companion crops.
@Nunyabiz do you chop your cover crop from time to time or just leave it grow??