论文部分内容阅读
八十年代以来,由于气候干旱,雨量少而不均;耕作制度的改变,机耕面积大幅度下降,撂荒地不断扩大,从而形成了有利于土蝗生存繁殖的生态环境。我省土蝗的发生面积和危害程度的逐年加重,局部达到暴发成灾、猖獗危害的地步.土蝗在目前已成为我省农业生产上的主要害虫之一。一、土蝗发生的危害情况五十年代末到六十年代初期,河北省曾有土蝗发生危害的记载,发生危害地常是我省的内涝飞蝗区。随着环境条件和生态条件的变化,八十年代以来,土蝗危害日趋严重。1985年全省发生663.7万亩,1986年为1083万亩,1987年上升为1437.6万亩,1988年高达1913.52万亩
Since the 1980s, because of the arid climate and less and less rainfall, the tillage system has changed dramatically, the area of plowed land has dropped drastically, and wasteland has been continuously expanded. As a result, an ecological environment conducive to the survival and reproduction of soil locusts has been formed. The occurrence area and degree of harm of soil locusts in our province have been increasing year by year, and the locusts have become one of the major pests in agricultural production in our province. First, the hazards of soil locust occurred The late fifties to the early sixties, Hebei Province, there have been described the occurrence of soil locust, the occurrence of hazards is often in our province of waterlogging Locust area. With the changes of environmental conditions and ecological conditions, the hazards of soil locusts have become increasingly serious since the 1980s. In 1985, 66.37 million mu occurred in the whole province, 10.83 million mu in 1986, 14.376 million mu in 1987 and 19.1352 million mu in 1988