Three groups of 20 fourth-instar nymphs or adults were chosen randomly and used in each experiment. Insects of
both life stages were sprayed using the formulations tested. After immersion, nymphs and adults were separated into three groups of 20 (60 insects for each treatment) and placed in glass flasks (63 cm2 9 12 cm) covered with a screen tissue and provided with cotton seed and sterile water. All groups were maintained in a humid chamber ([90% rh) at 28C under a 16:8 L:D photoperiod. Nymphs and adults were observed daily to determine survival and mortality. Individual experiments were replicated three times.