A Field Trial of Phosphine Fumigation on a High Resistant Strain of Rusty Grain Beetle in Paddy Rice Stored in Horizontal Storage
A phosphine fumigation trial was conducted on bulk paddy rice stored in a horizontal warehouse（10.19.13.8 m). The rice was covered with clear PVC sheeting(0.14 mm thick) that was sealed to the walls by pushing it into a slot with a rubber pipe. Phosphine was applied as aluminium phosphide three times during the fumigation at application rates of 6,3 and 1 g/m3 of tablets. The aim was to determine the suitability of the storage for fumigation and the application rate needed to control very highly resistant Cryptolestesferrugineus. Cages of highly resistant（x328) and susceptible Rhyzopertha dominica and a strain of C.ferrugineus collected from the paddy were placed under the sheeting at the beginning of the fumigation. Phosphine concentration was monitored during the fumigation. Despite gas leakage due to the poor condition of the warehouse, phosphine concentration was maintained at>200 mL m-3 for more than 35 days. Insect cultures could be clearly observed through the covered plastic sheeting during the fumigation. There were no active adults of susceptible or resistant R. dominica after 3 and 15 days, respectively. However, C. ferrugineus adults could be observed moving in the cages until day 30. No insects were present in the grain six months later when the sheeting was removed. The results indicate that very highly resistant strains can be controlled if a sufficient concentration of phosphine is maintained for along enough exposure period. The appropriate exposure period can be accurately determined by observing the response of the insects infesting the grain mass.
phosphine fumigation rusty grain beetle ezposure time
Wang Dianxuan Kuang Guozhu Jiang Shecai
Henan University of Technology, Zhengzhou, Henan 450052, China Zhongshan Grain Reserve and Management Ltd.,Zhongshan, Guangdong,528400, China
国际会议
成都
英文
637-640
2008-09-21（万方平台首次上网日期，不代表论文的发表时间）