SUSCEPTIBILITY OF ADULT CHRYSOMYIA ALBICE PS (WIEDEMANN, 1819), COCHLIOMYIA-MACELLARIA (FABRICIUS, 1775) LUCILIA-CUPRINA (WIEDEMANN, 1830) (DIPTERA, CALLIPHORIDAE) TO INSECTICIDES

Experiments were conducted in 1995 to determine the susceptbility of C hrysomyia albiceps (Wiedemann, 1819), Cochliomyia macellaria (Fabriciu s, 1775) and Lucilia cuprina (Wiedemann, 1830) to eight insecticides. Wild flies were collected on Estacao Experimental pam Pesquisas Parasi tologicas W.O. Neitz - UFRRJ, and were reared in the Laboratory of Ent omology to the F2 generation for topical application tests. A two perc ents stock concentration for all insecticides was made on the basis of weight of technical insecticide per volume of acetone diluent. Reduce d concentrations were mixed on a volume to volume basis. Flies to be t reated were withdrawn from the holding cage with a modified vacuum cle aner; immobilized with CO2 and then treated with the insecticides usin g a Hamilton microsyringe. The mortality of the flies was registrated after twenty-four hours of treatment. The regressions of dosage on mor tality were made by the computarized probit analysis program POLO (Pro bit or Legit Analysis). Based on the LD50 values, the inseticide toxic ities in descending order for males and females of C. macellaria were coumafos, fanfur, ronel, phosmet, crufomato, fenvalerate, triclorfon a nd malathion. Based on the same values, the insecticide toxicities in descending order for males and females oft. cuprina were fanfur, couma fos, ronel, crufomato, fenvalerate, phosmet, triclorfon and malathion. The insecticide toxicities in descending order for males of C. a(bice ps were coumafos, ronel fanfur, phosmet, crufomato, fenvalerate, tricl orfon and malathion, and for females were coumafos, ronel, fanfur, pho smet, crufomato, fenvalerate, malathion and triclorfon.