TOLERANCE OF SEWAGE-TREATMENT PLANT MICROORGANISMS TO MOSQUITOCIDES

Beneficial protozoa and rotifers collected from a wastewater treatment plant in Panama City, FL, were tested for tolerance to 11 commonly us ed mosquito larvicides and adulticides in the laboratory. The acute ef fects were assessed using selected concentrations of the adulticides f enthion, malathion, naled, permethrin, and resmethrin; and the larvici des Bacillus thuringiensis israelensis, Bacillus sphaericus, diflubenz uron, larviciding oil, methoprene, and temephos for the following micr oorganism taxa: ameoboids, flagellates, free-swimming ciliates, stalke d ciliates, and rotifers.