Study on the Control Flat Grain Beetle( Cryptolestes ferrugineus. Stephens) Effectively with MultiFumigation Technology and MultiPesticide

摘要

Taking into account pest biology and pesticide characteristics, a study was done to evaluate （1) phoshine （PH3) fumigation with recirculation, and （2) intermittent fumigation with recirculation using PH3 and dichlorvos(DDVP),to design the new treatment protocols for controlling Cryptolestes ferrugineus Stephens and Liposcells bostrychophila L. The aim was not only to maximize the evenness of PH3 distribution in the warehouse, but exploiting differences in sensitivity of the two pests to PH3and DDVP,thus overcoming C.ferrugineus and L. bostrychophila with strong resistance to PH3. The results indicated that an initial PH3 concentration of 700 mL/m3 usually means that PH3 concentration is maintained at 300-500 mL/m3 for 16-25 days with resulting in an insect disinfestation rate of was 100%,with no live insects detected for 1 year afterwards. Once PH3 concentration falls to 200 mL/m3,PH3 fumigation fails to control C.ferrugineus.