Resistance to Insecticides in Almond Moth, <i>Ephestia cautella</i> WALKER

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  • コナマダラメイガの薬剤抵抗性について
  • コナマダラメイガ ノ ヤクザイ テイコウセイ ニ ツイテ エイブン 1
  • I. Development of Methyl-parathion Resistance
  • 第1報 メチルパラチオン抵抗性の発達

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Abstract

An attempt has been made to obtain an insecticide resistant strain of the almond moth, Ephestia cautella, under laboratory conditions. The selection pressures on the last instar larvae at an 80% mortality level by contacting on dry residue of methyl-parathion resulted in apparent development of resistance at the 6th generation and 7 times resistance at the 16th generation. The heterogeneity of the selected strain toward the toxicant became great in the early generations of selection and then small as the resistance developed. Decrease of resistance level by the removal of selection pressure was small after the 14th generation. During the course of selection, the resistant strain showed pinkish body color in larvae and whitish wings in adult. However, those color changes did not correspond directly to resistance, but seemed to be due to genetic make-up by chance. The methyl-parathion resistant strain showed cross resistance only to some of dimethyl-ester type organophosphoric compounds such as sumithion, methyl-paraoxon and malathion, and not to diethyl-ester type insecticides such as ethyl-parathion and EPN. Finally, the sensitivity of cholinesterase to methylparaoxon and the activities of aromatic esterase, aliphatic esterase and cholinesterase were compared between the selected and unselected strains.<br>Cholinesterase and aromatic esterase are not found being responsible for the resistance, but as to aliphatic esterase, no decisive conclusion could be drawn out.

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