Have you ever looked into using
SNS209? It is all natural and provides the plants the systemic means to uptake small amounts of Rosemary, which either kills or makes the pests want to go elsewhere. You can also use it as a foliar spray, but I have only ever used it systemically.
Here's part of their blurb:
Sierra Natural Science SNS 209 is a concentrated all natural systemic pest control used to protect plants against spider mites, fungus gnats, scale, thrips and whiteflies. Made from a select blend of 100% pure botanical extracts that are all food grade GRAS (generally recognized as safe).
Good luck in that heat down there.
I had to go to Chandler for business once in June. My buddy told me to make sure that I told the car rental place that I wanted a vehicle with air conditioned seats.
I thought he was joking. I found out he was not.