Dc. Sheppard et Ja. Joyce, INCREASED SUSCEPTIBILITY OF PYRETHROID-RESISTANT HORN FLIES (DIPTERA,MUSCIDAE) TO CHLORFENAPYR, Journal of economic entomology, 91(2), 1998, pp. 398-400
Chlorfenapyr (AC 303630) was found to be 5 times as toxic to pyrethroi
d-resistant horn flies, Haematobia irritans (L.), as to susceptibles.
We hypothesize this difference occurs because higher levels of mixed f
unction oxidases in the resistant flies convert more chlorfenapyr (a p
ro-insecticide) to the insecticidal form. This negative cross-resistan
ce between chlorfenapyr and pyrethroids offers new resistance manageme
nt possibilities.