Don't use any sort of synthetic chemical pesticide such as any pyrethroids or pyrethrum. They are systemic and will become part of the plant. You need something that is a contact killer that does not compromise your crop. I discovered Greenbug for Outdoors which is a food grade safe product made with cedar oil. It works great on mites, aphids, whitefly, etc. but does no harm to the plants. Google 'Greenbug for Outdoors' and get it online.