Evaluation of the effectiveness of carbamates and pyrethroids against cockroaches--Blattella germanica (L.) on ships and in a port town.

The laboratory tests were aimed at determination of the effectiveness of 3 insecticides: propoxur, permethrin and deltamethrin against cockroaches, Blattella germanica (L.) caught on Polish merchant ships and in some communal buildings in the town Gdynia. The contact method with use of glass jars was applied. A total of 1700 specimens of B. germanica (males, females and larvae) has been examined. In this material there were: 720 specimens from ships, 620 from communal buildings and 360 from susceptible laboratory colony. There were carried out 116 tests: 37 with propoxur, 38 with permethrin and 41 with deltamethrin. The controls involved: 27 tests with acetone and 27 with use of the B. germanica (L.) susceptible strain. Out of the insecticides tested a very high effectiveness was shown in case of deltamethrin--in regard to all the cockroaches under investigation, and propoxur--against the cockroaches from the communal buildings. The toxic efficacy of permethrin was low.