Fig. 1

Mean number (±SEM) of Rhyzopertha dominica progeny production (expressed as adults/vial) for the susceptible (Lab-S) and resistant (Met-R) strain for all the combinations tested (control, 0.01 mg/kg, 0.03 mg/kg, 0.1 mg/kg, 0.3 mg/kg, PBO, 0.01 mg/kg + PBO, 0.03 mg/kg + PBO, 0.1 mg/kg + PBO, 0.3 mg/kg + PBO for susceptible and control, 1 mg/kg, 3 mg/kg, 10 mg/kg, 30 mg/kg, PBO, 1 mg/kg + PBO, 3 mg/kg + PBO, 10 mg/kg + PBO, 30 mg/kg + PBO for resistant). Within each bar and strain, means followed by the same lowercase letter do not differ significantly according to Tukey Kramer HSD test at P< 0.05. Where no letter exist, no significant differences were noted. Means with asterisk (*) for the application with s-methoprene alone are significantly different for the respective mean of the combination with s-methoprene and PBO at the resistant strain (Met-R)