补药控制偏高磷化氢浓度熏蒸锈赤扁谷盗生产试验

针对灯光诱捕和取样检查都发现锈赤扁谷盗发生数量较多的储藏稻谷,实仓进行了补充施药控制偏高磷化氢浓度杀虫试验,试验仓房的气密性为500 Pa正压半衰期为30 s.试验结果为:在粮面施用磷化铝粉剂和通风口施用磷化铝片剂后,环流20 h仓内磷化氢浓度可达130 mL/m3～170 mL/m3,施药3d后两种剂型药剂都达到了释放磷化氢的高峰(800 mL/m3),随后磷化氢浓度较快地下降.通过分别2次补充施药后,保持磷化氢浓度在400 mL/m3以上的时间达6d,300 mL/m～400 mL/m3的时间达9d,200 mL/m3～300 mL/m3的时间7d.试验仓熏蒸中磷化氢控制偏高浓度(大于300 mL/m3)的时间达到了15 d.在此偏高浓度下,9d后大部分害虫死亡,整个熏蒸过程实现了完全杀死锈赤扁谷盗.

FIELD TRAIL OF CRYPTOLESTES FERRUGINEUS (STEPHENS)FUMIGATED WITH HIGHER LEVEL OF PHOSPHINE CONCENTRATION MAINTAINED BY ALUMINIUM PHOSPHIDE SUPPLEMENT

The field trial of phosphine fumigation was carried out that was focus on the Cryptolestes ferrugineus(Stephens)control completely in a horizontal storage of paddy rice,in which the population of the insect was similarly high both monitored by the method of sieving and light trap attracting.The gastightness of the warehouse was 30 seconds of half time decreased from 500 Pa to 250 Pa.The results involved in that the phosphine concentration reached to 130-170 mL/m3 in 20h after aluminium powder and tablet application.The peak concentration,800 mL/m3 was monitored in three days.And then the concentration went down quickly.The maintaining time of phosphine was six days above 400 mL/m3,nine days in 300-400 mL/m3,seven days in 200-300 mL/m3.Total time of more than 300 mL/m3 was 15 days.Through the process of phosphine concentration maintaining the insect population was killed fully and successfully.