• Title/Summary/Keyword: 감자뿔나방

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Effect of Electron Beam Irradiation on the Development and Reproduction of Phthorimaea operculella (Lepidoptera: Gelechiidae) (전자빔 조사가 감자뿔나방의 발육과 생식에 미치는 영향)

  • Cho, Sun-Ran;Ahn, Hyeonmo;Eom, Taeil;Kyung, Yejin;Lee, Seung-Ju;Kim, Hyun Kyung;Koo, Hyun-Na;Kim, Gil-Hah
    • Korean journal of applied entomology
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    • v.60 no.2
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    • pp.255-262
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    • 2021
  • The potato tuber moth, Phthorimaea operculella (Zeller) has been known as a quarantine pest of potato. This study investigated inhibition doses of electron beam irradiation (EBM) by comparing their effects on the development and reproduction and DNA damage of the insect pest. Eggs (0-12 h old), larvae (3rd and 5th instar), pupae (less than 1 d old after pupation) and adults (less than 1 d old after emergence) were irradiated with increasing doses of EBM. The EBM with 150 Gy could not completely prevent the hatchability of eggs and pupation of the hatched larvae. The hatchability from the irradiated eggs were 19.3%. However, adult emergence from the irradiated eggs were completely inhibited. When 3rd and 5th instar larvae were irradiated at 100 Gy, the adult emergence from the irradiated larvae and the fecundity of the adults were completely inhibited. When pupae and adults were irradiated at 300 Gy and 400 Gy, respectively, the hatchability of the F1 eggs was completely inhibited. The alkaline comet assay on the level of DNA damage by EBM in P. operculella adults indicates that the EBM increased DNA damage level in a dose-dependent manner, and the damage was repaired in a time-dependent manner. These results may recommend EBM of 150 Gy as a phytosanitary treatment for P. operculella. However further confirmative study is required for the practical application of this EBM dose for P. operculella disinfestation.

Insecticidal Activity and Effect on Biological Characteristic of 16 Insecticides Against Phthorimaea Operculella (Lepidoptera: Gelechiidae) (감자뿔나방에 대한 16종 살충제의 살충활성과 생물적 특성에 미치는 영향)

  • An, Jeong-Jin;Park, Jun-Won;Kim, Ju-Il;Kim, Hyun Kyung;Koo, Hyun-Na;Kim, Gil-Hah
    • The Korean Journal of Pesticide Science
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    • v.17 no.4
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    • pp.363-370
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    • 2013
  • 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 recommended concentrations. Deltamethrin and spinosad yielded 100% mortality for adult P. operculella 48 h after treatment. 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 emamectin benzoate maintained 100% insecticidal activity 14 days after treatment and ethofenprox maintained over 90% activity 7 days after treatment.