Abstract
Baits containing 0.125% Kepone® (decachloroocta hydro-I, 3, 4-metheno-2H-cyclobuta[cd]pentalen-2-one) or 2% propoxur, with or without p-nitrophenol mold inhibitor, and embedded into paraffin cakes, were placed in sewer access shafts containing Periplaneta americana (L.) to determine if control could be achieved. Cockroaches did not feed on propoxur baits. Feeding occurred on some Kepone baits with and without mold inhibitor, but they did not feed on Kepone baits after mold became visible. Addition of the mold inhibitor reduced the molding of propoxur and Kepone baits. There was a reduction in cockroach numbers in baited sewer-access shafts; however, dead cockroaches were observed only in shafts containing Kepone baits with visible feeding signs. Cockroach numbers increased in shafts with paraffin check cakes. Baits in moist shafts increased in weight by absorbing ambient moisture. Baits disintegrated in humid shafts with high ambient temperatures.
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