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ISSN : 1225-0171(Print)
ISSN : 2287-545X(Online)
Korean Journal of Applied Entomology Vol.56 No.3 pp.253-259
DOI : https://doi.org/10.5656/KSAE.2017.05.0.010

Enhanced Control Efficacy of a Fumigant, Chlorine Dioxide, by a Mixture Treatment with Carbon Dioxide

Chulyoung Kim, Hyeok Kwon, Wook Kim, Yonggyun Kim

Abstract

Fumigation using chlorine dioxide (ClO2) has been regarded as a potential control technique against stored grain insect pests. The control efficacy can be enhanced with increase of opening rates of spiracles by facilitating the toxic gas delivery to internal body. To test this hypothesis, this study used the Indianmeal moth, Plodia interpunctella, which was known to be susceptible to ClO2, and analyzed the opening rate of spiracles. A total of 9 pairs of spiracles were observed in P. interpunctella larvae, in which one pair was located on the prothorax and eight pairs were on the abdomen. Within the body, the spiracles were connected to longitudinal and transverse tracheal trunks. The open spiracles were determined by the dye-infiltration method. Based on this method, the opening rate of spiracles increased up to about 60% with increase of ambient temperatures. Furthermore, exposure to carbon dioxide stimulated the opening rate of spiracles up to about 95%. In contrast, exposure to ClO2 prevented the spiracle opening and resulted in only 25% of spiracles in an opening state. The addition of carbon dioxide to ClO2 treatment rescued the opening rate of spiracles as much as the carbon dioxide single treatment. Based on this modulatory activity of carbon dioxide against spiracles, the combined treatment of ClO2 with carbon dioxide resulted in significant increase of its toxicity against P. interpunctella compared to a single ClO2 treatment.

이산화탄소 혼합 처리를 통한 이산화염소 훈증 처리 효과 제고 기술

초록

 

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