Abstract
Abstract Susceptibility of each developmental stage of Phthorimaea operculella (Lepidoptera: Gelechiidae)were investigated using 16 insecticides which are available in the market in Korea. For the eggs and pupae,only spinosad showed a 71.1% inhibition rate for egg hatchability and a 66.7% inhibition rate for emergence.For the 3rd instar larvae, the feeding toxicities were over 90% for fenitrothion (LC 50 336.6 ppm),esfenvalerate (LC 50 8.6 ppm), ethofenprox (LC 50 35.7 ppm), and emamectin benzoate (LC 50 0.05 ppm).Furthermore, the contact toxicities were over 90% for esfenvalerate (LC 50 0.87 ppm), ethofenprox (LC 50 16.5 ppm), emamectin benzoate (LC 50 0.53 ppm), and spinosad (LC 50 2.48 ppm) at the recommendedconcentrations. Deltamethrin and spinosad yielded 100% mortality for adult P. operculella 48 h aftertreatment. The adult female fecundity was inhibited by deltamethrin, esfenvalerate, emamectin benzoate,spinosad and dinotefuran, which were significantly different from the control. The adult longevities (7.3-8.3 days) were reduced by approximately 1-2 days compared with the control (9.3 day). The emamectinbenzoate maintained 100% insecticidal activity 14 days after treatment and ethofenprox maintained over 90%activity 7 days after treatment.Key words Phthorimaea operculella, Feeding toxicity, Contact toxicity, Systemic effect, Residual effect
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