2015 Volume 30 Issue 1 Pages 19-22
Insecticide-impregnated nets exhibited good killing effect against a susceptible strain of the German cockroaches in a non-choice test, but were not effective against a field-collected colony in the same test. However, bait consumption of field-collected German cockroaches was not influenced when baits were put at the center of the net. When a harborage made of folded impregnated net was placed with untreated net separately in the same arena, the field-collected cockroaches deposited few feces on the insecticide-impregnated net in comparison with the untreated net due to repellent activity. When the net was stuck to the inside of the harborage, the cockroaches were reluctant to enter it, but they stayed and deposited many feces in the non-treated net harborage. Putting impregnated nets into the cracks and crevices of walls or coiling with nets around stands of food processing lines might effectively prevent cockroach infestations.
