RESIDUAL EFFICACY OF CHLORPYRIFOS AND DIAZINON FORMULATIONS FOR GERMAN COCKROACHES (ORTHOPTERA, BLATTELLIDAE) ON PANELS PLACED IN COMMERCIAL FOOD PREPARATION AREAS

Ceramic and stainless steel panels were treated with chlorpyrifos (Dursban LO or ME) or diazinon (Knox Out 2FM) and aged in a commercial kitchen. Type of surface (ceramic tile or stainless steel) did not significantly affect residual performance of formulations used for control of adult male German cockroaches, Blattella germanica (L.). Microencapsulation stabilized the residues of both chlorpyrifos and diazinon and caused 100% mortality of susceptible German cockroaches for 8 weeks and resistant cockroaches for 4 weeks. The emulsifiable formulation provided only 0-67% mortality after 1-2 weeks.