Each treatment and control werereplicated five times. The experiment was performed in an air-conditioned laboratory with temperature set at 26 ± 2◦C, 60 ± 5%RH, and photoperiod of L:D 16 h:8 h. Mortality was observed after24 h of exposure. When no leg or antennal movements were noticedupon gentle prodding with a brush, insects were considered dead.