I lived in Camden county, Ga (just south of you on the Florida border) for most my life until 3 years ago, never had a problem with mites and one case of lice. Sevin dust kills lice on contact, DE wont. No need to treat your birds unless they actually have external parasites. Simply inspect them occasionally for external parasites. Telltale signs that lice are present is that you'll observe excessive scratching, constant dust bathing, and feather/fluff loss due to scratching, excessive preening. Lice are white or off white in color and move quickly through feathers and fluff. Mites look like black or red pepper, move slowly or not at all. They suck blood causing anemia, then death. The vent area is a favorite place for external parasites due to it being warm and moist.
As far as mosquitos are concerned in our area; put screen on coop vents and entrance to coop to deter them (see pic below.)
Alot of folks around our area vaccinate their birds against fowl pox which is a virus carried by mosquitos. For reference, here's a link with pics what external parasites to look for... you'll need a magnifying glass to identify whatever parasite(s) your birds may have:
http://edis.ifas.ufl.edu/ig140
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