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鲁北地区是黄淮流域重点大豆产区之一。本区年平均气温11.7—12.9℃,雨量550—650毫米,热量资源丰富(大于0℃的积温4700℃左右),为大豆的生长发育提供了有利条件。由于豆株枝叶繁茂,田间湿度较高,食料丰富,使豆田成为多种害虫天敌发生、繁衍、活动和栖息的场所。过去,由于豆田耕作粗放,化防次数少,使这些天敌资源得以保存下来,在控制豆田害虫的发生和发展方面起到了不可忽视的作用。目前,由于生产责任制的逐步完
Lubei area is one of the key soybean producing areas in Huang-Huai River Basin. The average annual temperature of 11.7-12.9 ℃, rainfall 550-650 mm, rich in heat resources (greater than 0 ℃ accumulated temperature of 4700 ℃ or so), for the growth and development of soybean provided favorable conditions. As the bean plants lush foliage, high humidity in the field, food-rich, bean fields become a variety of natural enemies of pest occurrence, reproduction, activity and habitat. In the past, due to the extensive cultivation of bean fields and the small number of chemical and biological preventions, the resources of these natural enemies were preserved and played a significant role in controlling the occurrence and development of bean pests. At present, due to the gradual completion of the system of production responsibility