Evaluation of inert dusts against phosphine resistant strains of <i>Cryptolestes ferrugineus</i>

  • Y. Cao Academy of State Administration of Grain, P.R. China, Beijing 100037. Email: lyy@chinagrain.org
  • Y. Li Academy of State Administration of Grain, P.R. China, Beijing 100037
  • G. Li Academy of State Administration of Grain, P.R. China, Beijing 100037

Abstract

The relative phosphine resistance of two strains of Cryptolestes ferrugineus was measured by the method of knockdown at 2 mg/L of phosphine. The efficacy of five inert dusts (Puliangtai, G-1, G-2, G-3 and G-4) against the adults of two strains (JXCF and YYCF) of C. ferrugineus was assessed. The insects were exposed to the five inert dust on filter paper inside petri dishes for 1 day at 30±1°C and 65±1% r.h. Then, the adults were held for 4 days with food at the same conditions without inert dust in surface bioassay. Also, they were placed in 25±1°C and 65±1% r.h. in grain bioassay. In surface bioassay, the two strains of C. ferrugineus were susceptible to the five inert dusts at 0.08 g/m2 and 0.1 g/m2. G-3 appeared the most effective against both strains, since its efficacy was 3-6 times higher than the other four dusts tested. YYCF strain was more susceptible than JXCF, with 1-4 times higher mortality level. The five inert dusts were also effective in grain bioassay. This research indicated that inert dusts were effective on phosphine-resistant C. ferrugineus populations.

Keywords: Inert dust, Cryptolestes ferrugineus, Phosphine resistance
Veröffentlicht
2010-09-20
Rubrik
Section: Residual Insecticides - Synthetic and Botanical