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Glyphodes pyloalis Walker is a serious pest of mulberry trees in Iran. In this study, lethal (LC₅₀ = 19 ppm) and sublethal effects (LC_{10 =} 3.74 andLC₃₀ = 9.77 ppm) of lufenuron were evaluated against 4^th instar larvae of G. pyloalis. After treating the larvae at LC₃₀ and LC₅₀ level, most of them died during the molting process and only a few individuals developed to the 5^th larval instar. The highest rate of mortality wasobserved in 5^th larval (68.42%) and pre-pupal (59.57%) stages at LC₅₀ concentration. Also, lufenuron caused an increase in larval, pre-pupal and pupal developmental periods. The successful pupation decreased to 53.64% at the LC₃₀. Also, no prepupa molted to pupation after treatment of larvae at the LC₅₀. Larval weight was significantly reduced at 48, 72 and 96 h after treatment, compared to the control. Adult emergence and female longevity were also reduced at LC₃₀. The LC₃₀ of lufenuron negatively affected reproduction of G. pyloalis. Larval content of carbohydrate and protein were decreased significantly 48 and 72 h after treatment, however, lipid and glycogen content were decreased significantly only 72 h after treatment at LC₁₀, LC₃₀ or LC₅₀. Findings indicated adverse effects on some biological and biochemical parameters at lethal and sublethal concentrations of lufenuron which necessitate further investigations for its application in an integrated management of G. pyloalis.

Keywords: Glyphodes pyloalis, lufenuron, fecundity, sub-lethal effects, IGR

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