甘肃河西走廊甜菜象虫种类分布及防治

据1986～1989年调查,甘肃河西走廊为害甜菜的象虫种类有:甜菜象、甜菜毛足象、甜菜碗额象等19种。其中以甜菜象、甜菜毛足象为优势种。药剂处理种子防治象虫试验结果表明:35％甲基硫环磷乳油、种子、水以2.2～3.0∶100∶100配方防治效果较佳,毒苗杀虫率达90.0％～92.0％,且残效期长,田间保苗率达83.5％～92.5％,挽回根产量损失29.7％～39.1％。

Distribution and Control of Russelkaefer Species in Hexi Corridor in Gansu Province

About 19 species of Russelkaefer were found according to the investigation in Hexi Corridor in Gansu Province in 1986~1989,Bothynoderes puncti-venlris Germar, Phacephorus umbratus Faldermann, Gronops sp, Conorrhynchus conirostris Gebler, Tanymecus urbanus Gyllenhyl, Chromoderus declivis Olivier, Cleonus piger Scopoli and so on Among them, Bothynoderes punctiventris Germar, Phacephorus umbratus Faldermann were predominant species in sugar-beet cultivation area. The results of insecticide control showed that seed treatment with 35% methylcyolane emulsion was an effective measure to prevent and control, the ratio of 35% methylcyolane emulsion: seeds:.water was 2.2~3.0 :100 :100. The ration of eliminating Russelkaefer by poison seedling was 90.0%-92.0% and the carry-over effect lasted for a long time. The establishment rate seedling was 83.5%~92.5%, the root yield could be retrieved about 29.7%~39.1%.