Penetrations of flupyrazofos against Plutella xylostella(Lepidoptera :Yponomeutidae) and Spodoptera exigua(Lepidoptera : Noctuidae)

배추좀나방과 파밤나방에 대한 flupyrazofos의 체벽 투과량

  • Lee, Sang-Guei (National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Hwang, Chang-Yeon (Institute of Agricultural Science & Technology, College of Agriculture, Chonbuk National University) ;
  • Han, Man-Jong (National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Yoo, Jai-Ki (National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Lee, Hoi-Seon (Institute of Agricultural Science & Technology, College of Agriculture, Chonbuk National University)
  • Published : 2000.03.31

Abstract

Tolerance mechanism to flupyrazofos was examined with Plutella xylostella (L.) and Spodoptera exigua by investigating the penetration rate of flupyrazofos into larvae body. On determining effective washing of $^{14}C$-flupyrazofos, the washing volume to recover over 98% of $^{14}C$-flupyrazofos was observed at three times (each time: 1 mL). To select a suitable solvent, the recovery rates of each solvent in 3rd instar larvae of DBM were above 98%, but the washing rates of acetone, hexane and ethyl-acetate were 85.1%, 67.2% and 68.4%, respectively. In the BAW larvae, although the recovery rates of each solvent were above 99%, the washing rates of acetone, hexane and ethyl-acetate were 83.5%, 65.9% and 71.7%, respectively. The $PT_{50}$ values of $^{14}C$-flupyrazofos were 0.731 h (44 min) in the DBM larva and 0.504 h (30 min) in the BAW larva. Radiocarbon in acetone washing (external fraction) decreased more quickly in the BAW larva than in the DBM larva, and amount of radiocarbon in larvae body increased more quickly with time in the DBM larva than in the BAW larva. In contrast, amount of radiocarbon in excreta increased more rapidly with time in the BAW larva than in the DBM larva.