Fumigation activities of ethyl formate on different strains of <i>Liposcelis bostrychophila</i>

  • Y.-X. Deng Chongqing Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400715, P. R. China. Email: yxdeng2002@yahoo.com.cn
  • J.-J. Wang Chongqing Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400715, P. R. China.
  • W. Dou Chongqing Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400715, P. R. China.
  • Z.-L. Yang Tongliang State Grain Reserve, Chongqing 402560, P. R. China
  • T.-K. Jiang Tongliang State Grain Reserve, Chongqing 402560, P. R. China

Abstract

The psocid, Liposcelis bostrychophila is a prevalent insect pest in large grain depots in P.R. China. Our previous research proved that ethyl formate killed psocid adults of susceptible strain within 24 h, and the fumigation efficacy at relatively low temperature was better than that at relatively high temperature. In this paper, fumigation activities of ethyl formate on DDVP and PH3 resistant strains of L. bostrychophila were studied by the sealed jar fumigation method under different ethyl formate concentrations, fumigation times, and temperatures. Results showed that treatment time and concentration significantly affected fumigation effectiveness of ethyl formate against L . bostrychophila adults at 30oC. The 50% lethal concentrations (LC50) of ethyl formate against two resistant strains increased as the temperature increased from 20o to 30oC. At 27±0.5oC and 24 h fumigation, the LC50 were significantly lower for DDVP and PH3 resistant strains than that of the susceptible strains and the LC50 of DDVP resistant strains were significantly lower than that of PH3 resistant strains.


Keywords: Fumigation activity, Ethyl formate, Liposcelis bostrychophila, Resistant strain

Veröffentlicht
2010-09-02
Rubrik
Section: Fumigation, Modified Atmospheres and Hermetic Storage