The occurrence regularity of wheat midgec (Sitodiplosis mosellana Gehin) was investigated in 1986 -1991. One generation of this kind of insects emergies every year,and its cocoon lies dormant in soil through the winte...The occurrence regularity of wheat midgec (Sitodiplosis mosellana Gehin) was investigated in 1986 -1991. One generation of this kind of insects emergies every year,and its cocoon lies dormant in soil through the winter and summer (total for over ten months). The active larvae have a habit to move up and down with the changes of soil temperature. The field experiment over three years has showed that DDVp, a slow-release pesticide,is significantly effective in reduction of wheat loss due to this pest. Thirteen wheat varieties which are resistant or tolerant to this pest have been obtained in Hebei province. The main points of the technique described in this paper is put in a nutshell: relying mainly on growing the resistant varieties of wheat while making chemical control subsidiary. The chemical control is carried out at the pupal stage to kill the insects as many as possible,and at the adult stage to wipe out the remnants. Over the last three years,as a result of the utilization of this technique in展开更多
文摘The occurrence regularity of wheat midgec (Sitodiplosis mosellana Gehin) was investigated in 1986 -1991. One generation of this kind of insects emergies every year,and its cocoon lies dormant in soil through the winter and summer (total for over ten months). The active larvae have a habit to move up and down with the changes of soil temperature. The field experiment over three years has showed that DDVp, a slow-release pesticide,is significantly effective in reduction of wheat loss due to this pest. Thirteen wheat varieties which are resistant or tolerant to this pest have been obtained in Hebei province. The main points of the technique described in this paper is put in a nutshell: relying mainly on growing the resistant varieties of wheat while making chemical control subsidiary. The chemical control is carried out at the pupal stage to kill the insects as many as possible,and at the adult stage to wipe out the remnants. Over the last three years,as a result of the utilization of this technique in
