For those who don't want to use expensive systemics here is an
organic approach. Eggs hatch Encarsia Formosa wasps that eat or parisitize the white flies. The parisitized flys will host the wasp eggs and a new Encarsia generation will attack the white flys. Check this out ----------------
Greenhouse Whitefly Parasite (Encarsia formosa) - 1,000
Would be great if something like this worked on squirrels.