论文部分内容阅读
粘虫在河北省中南部地区一年发生三至四代,以第三代大发生。第三代粘虫卵盛期一般发生在7月下旬至8月上旬,幼虫期在7月底至8月中旬末或下旬初。幼虫为害谷子、玉米、高梁、黍稷、稻类等禾本科作物,是粮食作物的重要害虫。粘虫是迁飞性害虫,在不同季节,南北往返迁飞,构成了不同粘虫世代的严重发生区。河北省中南部地区,为第三代多发区。就第三代粘虫而言,各年发生程度也不相同。1953、1955、1958、1960、1966、1971、1976年等为大发生年,而1954、1957,1959、1974年等为轻发生年。研究粘虫迁飞习性,掌握其迁飞规律,以预测其发生期、
Mythimna separata occur three to four generations a year in central and southern Hebei Province, with the third generation occurring. The third generation of egg infestation occurs generally in late July to early August, larval period from the end of July to mid-August or early late. Larvae damage millet, corn, sorghum, millet, rice and other gramineous crops, is an important pest of food crops. Mythimna separata is a migratory pest that migrates north and south in different seasons and constitutes a serious area for different generations of armyworm. Central and southern regions of Hebei Province, the third generation of multiple areas. As far as the third generation of armyworm is concerned, the incidence varies from year to year. 1953, 1955, 1958, 1960, 1966, 1971, 1976 and so on are the year of great occurrence, while 1954, 1957, 1959 and 1974 are the light years of birth. Study of migratory habits of armyworm to master its migration rules to predict its occurrence,