Piri F., Sahragard A., Ghadamyari M. (2014): Sublethal effects of spinosad on some biochemical and biological parameters of Glyphodes pyloalis Walker (Lepidoptera: Pyralidae). Plant Protect. Sci., 50: 135-144.The susceptibility of G. pyloalis larvae to spinosad was studied using the leaf dip method. Treatment with doses of spinosad sublethal concentrations (LC 10 , LC 20 , LC 30 , LC 40 of 0.026, 0.045, 0.065, 0.090 ppm, respectively) was applied. A significant difference in the effects was observed between the sublethal concentrations (LC 10 , LC 20 , LC 30 , and LC 40 ) and the control in the content of carbohydrate and glycogen, and between the control vs. LC 30 and LC 40 in the content of protein. A significant decrease in glutathione S-transferase activity with the increase of spinosad concentration, no significant differences in the activities of α-and β-esterases, and a significant increase in the enzyme activity of phenoloxidase were observed. Effects of LC 10 and LC 30 spinosad concentrations on some biological parameters showed that percentage of larval pupation and female fecundity significantly decreased in the concentration of LC 30 .