Response of Susceptible Laboratory and Resistant Field Strains of Spodoptera littoralis (Lepidoptera: Noctuidae) to Teflubenzuron

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Abstract
Spodoptera littoralis (Boisduval) larvae collected from a cotton field that was heavily sprayed with conventional insecticides showed strong resistance to organophosphates and pyrethroids and showed a mild tolerance to benzoylphenyl ureas. At LC50, the field strain was 120 and 102 times more resistant than the susceptible laboratory strain to chlorpyriphos and cypermethrin, respectively, and was slightly tolerant to teflubenzuron (5 times). At LC50, the resistance values increased to 161, 6,000, and 24 times for chlorpyriphos, cypermethrin, and teflubenzuron, respectively. These results indicate that multiresistance factors caused by various groups of insecticides may confer tolerance to teflubenzuron. The esterase inhibitor S, S, S-tributylphosphorotrithioate (DEF) synergized the toxicity of teflubenzuron against the resistant field strain and rendered the larvae again susceptible to teflubenzuron.