Insecticide resistance in Phthorimaea operculella (Zell.): larval responses to endrin and azinphos-ethyl

Abstract

The responses to endrin and azinphos-ethyl of all larval instars of a typical Queensland strain of Phthorimaea operculella are defined. Endrin resistance, previously reported in adults, was demonstrated in larvae. An increase in variability of larval response to azinophosethyl is recorded, as opposed to lack of any significant shift in tolerance when adults were used as test material.