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Fumigant activity of ethyl formate and phosphine to Phthorimaea operculella (Lepidoptera: Gelechiidae)
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- URLhttps://db.koreascholar.com/Article/Detail/288084
The potato tuber moth, Phthorimaea operculella (Zeller), is considered one of the main causes of potato losses during harvesting and storage. The pest occur throughout the year and its larvae damage the leaves, twigs and tubers. In this study, we have investigated the effects of ethyl formate (EF) and phosphine (PH3) against P. operculella. Fumigation to all stage of P. operculella was carried in a desiccator system at 5℃ and 20℃ for 24 h. As a result, LC99 of PH3 to all stage of P. operculella was showed 1.953 mg L-1 (eggs), 0.100 mg L-1 (larvae), 4.884 mg L-1 (pupae) and 0.240 mg L-1 (adults) at 20℃, respectively. LC99 of EF to all stage of P. operculella was observed 19.808 mg L-1 (eggs), 6.783 mg L-1 (larvae), 141.476 mg L-1 (pupae) and 3.223 mg L-1 (adults), at 20℃ respectively. Larvae and adults showed the highest susceptibility to PH3 and EF at 20℃. LC99 of PH3 to all stage of P. operculella was showed > 1.5 mg L-1 (eggs), 0.187 mg L-1 (larvae), > 1.5 mg L-1 (pupae) and 0.386 mg L-1 (adults) at 5℃ , respectively. LC99 of EF to all stage of P. operculella was showed 27.479 mg L-1 (eggs), 9.580 mg L-1 (larvae), 55.759 mg L-1 (pupae) and 3.084 mg L-1 (adults) at 5℃, respectively. These results indicated that the fumigant efficiency of PH3 and EF is more effective with treated in room temperatures against termites.
