粮面压盖密闭对磷化氢熏蒸防治锈赤扁谷盗的减量增效作用研究

Effect improvement by the grain surface membrane sealing during the cryptolestes ferrugineus prevention with phosphine fumigation

以某储备库30号高大平房仓为实验仓,用聚苯乙烯泡沫板对粮面进行压盖密闭,辅以食品级惰性粉粮面30 cm以下拌药,实现了PH3膜下低浓度环流熏蒸。与采用传统熏蒸技术的相同仓型对28号对照仓房相比,30号实验仓房用药量为20 kg,相比减少37.5%,PH3浓度半衰期延长一倍以上,达到19 d,PH3在设定浓度以上150 mL/m3保持28 d以上。相比28号对照仓杀虫率在45%~65%之间,30号实验仓杀虫率达到100%。说明压盖后的膜下环流熏蒸不仅可以减少磷化铝使用量,还可以大大提高对高抗性害虫锈赤扁谷盗的杀灭效果,达到磷化铝减量增效的目的。

Aluminium phosphide should be reduced in recent years, until the substitute was developed and employed. A low PH3 concentration circulating fumigation by sealing grain surface with polystyrene foam plate was developed combined with food grade inert powder flour mixture(LPCFSP). The performance of LPCFSP was studied in No. 30 large ware house with No. 28 large ware house as control, which was fumigated with conventional method. LPCFSP could reduce 37.5% aluminium phosphide to 20 kg. The half-life of PH3 was doubled to 19 days and the period of PH3 above 150 mL/m3 was more than 28 days in No. 30. The insect killing rate of high-resistance pest cryptolestes ferrugineus was 100% in No. 30, which was considerably higher than that in No. 28 with a killing rate of 45%~65%. The study proved that LPCFSP can be recommended for the high performance in aluminium phosphide reducing and insect killing.