We had extremely cold temperatures, a power outage, and no backup heating system for the greenhouse. He piled it full of briquets and lit them. The greenhouse was kept above freezing, but the air was so thick with with smoke that you could not breathe it. The tomato plants were saved, and all of the whiteflies on them were killed. Use in combination with yellow sticky traps.
Whiteflies love fuchsia.
Whiteflies are a difficult problem. I live in Maryland and we have planted some fall Pansies. Unfortunately the ground hogs and bunnies seem to think that they are quite delicious. Remembering that the cat is the rabbit's natural enemy, put your house cat to use. Placed the fur around your garden, especially by plants that the rabbit preferred.