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Changes of Feeding Behaviors of Myzus persicae (Homoptera: Aphididae) Depending on Inflow Concentrations of Imidacloprid

  • Seo, Mi-Ja (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Kang, Myong-Ki (Dongbu Hiteck) ;
  • Jo, Beom-Haeng (Central Research Institute) ;
  • Hwang, In-Cheon (Central Research Institute) ;
  • Jang, Chul (Central Research Institute) ;
  • Yu, Yong-Man (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Youn, Young-Nam (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University)
  • Published : 2008.12.30

Abstract

After treatment with imidacloprid, there were clear differences in the time to the first reaction of Myzus persicae among the concentrations treated. The time taken for the proboscis of the aphids to penetrate, during the recording plants increased as the imidacloprid concentration increased. Imidacloprid concentration inflow into a leaf was investigated using high-performance liquid chromatography, and the residues of the imidacloprid varied slightly with the different concentrations treated. However, the inflow rates of this insecticide into a leaf increased as the dipping times increased. Furthermore, it was shown that there was no relationship in inflow concentration between the concentrations and times of treatment. However, the concentration in the leaf differed according to the dipping time. Judging from the fact that the first reaction behavior against imidacloprid displayed at an inflow concentration of 0.32-0.35 mg/L, we concluded that inflow concentrations causing the first reaction of the aphids to the insecticide were much lower than the concentration treated. The general feeding characteristics of the aphids indicated that xylem and/or phloem feeding behavior continued after a series of probing behaviors and stylet activity during the first 3 h from the start of EPG recording. After 90 min treatment with imidacloprid, feeding behavior over the next 30 min indicated a significant increase in the withdrawal of the stylet from the plant at all treated concentrations. Xylem and/or phloem feeding patterns were significantly decreased during this time. In particular, the proportion of xylem feeding differed according to the concentration of imidacloprid.

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