Abstract
Contamination of tick colonies by molds is a widespread problem. Ticks held in moldy containers have a consistently higher mortality rate compared with containers having little or no mold growth. Three fungicides (captan, folpet, benlate), a wetting agent (Triton X-100), and chlorine gas (from 0.052% aqueous sodium hypochlorite) were evaluated for activity against the moldsAspergillus sydowi andPenicillium citrinum in laboratory colonies of the lone star tick,Amblyomma americanum (L.). Only chlorine gas caused a significant reduction in mold growth in paper containers used to hold ticks, without harming them. Significantly more adults were alive at 180 days post-treatment in aquaria with chlorine gas than in chlorine-gas-free aquaria, whereas mortality in nymphs under these conditions was unchanged. Eggs oviposited in aquaria treated with chlorine gas failed to hatch.
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