论文部分内容阅读
永靖县的大棚蔬菜生产区目前已由黄河两岸的河谷川地发展到台地和塬地，而且山区群众在科技人员的指导下也开始试种，并取得了明显的效果，１９９９年全县大棚蔬菜面积已发展到６６６．６７ｈｍ２以上。但近年来大棚蔬菜上白粉虱的危害日益加重，经调查，所有大棚蔬菜上均有白
Yongjing County, the greenhouse vegetable production area has now been developed from the Yellow River valley to the plateau and plateau, and mountains in the scientific and technological personnel under the guidance of the people began to test, and achieved significant results, in 1999 the county shed Vegetable area has grown to 666.67hm2 above. However, in recent years, greenhouses on the whitefly in the growing hazards of vegetables, after investigation, all greenhouse vegetables are white