富氮控氧法对三种虫态烟草甲杀灭效果

为了较准确、及时的预报包头地区的短时强降水,利用常规气象资料、自动站、FY-2E TBB资料和NCEP1°×1°逐6h再分析资料,对2014年8月1-2日包头地区的短时强降水天气过程进行了诊断分析。结果表明：贝加尔湖高空冷涡发展为有利大尺度环流背景,低层切变线和地面倒槽是造成此次短时强降水的主要系统,除此之外,中小尺度系统的发展和不稳定能量的强烈释放是主要原因。TBB(云顶亮温)值较低(-45°至-53°)的对流云团也导致了强降水的发生发展,TBB低值区与强降水中心有较好的对应,TBB场能较直观的反应了强降水的分布和强度。

Mortality of Three Stages of Lasioderma serricorne in Low Oxygen Environment Controlled by Nitrogen

The new technology which modified oxygen concentration of an enclosed space by nitrogen was safe and effective for tobacco storage. Eggs, larva, and adults of Lasioderma serricorne were exposed in different low oxygen environment, and Probit analysis was used to determine the LT99 values. The results indicated that the time to reach LT99 of eggs, larvae and adults of L. serricorne in low oxygen environment produced by nitrogen generating equipment were much shorter than that in low oxygen environment produced by chemical method. Generally, low oxygen concentration between 1.5% and 2% was more effective to control eggs, larvae and adults of L. serricorne. The low oxygen environment produced by nitrogen could kill L. serricorne effectively during tobacco storage.