张家口坝下地区属春玉米区,玉米红蜘蛛(Tetraychus truncatus Ehara截形叶螨)在各县、市都有发生,旱年为害尤重。被害玉米叶片完全变白甚至早枯,籽粒秕瘦、产量降低,障碍玉米增产。为此,我们于1977—1979年对玉米红蜘蛛在春玉米区的发生与防治作了初步研究,提出了以早春杀伤杂草上的越冬红蜘蛛为基础的综合防治措施,经在生产上应用,已初见成效。现将研究结果报道如下。 The area under the dam of Zhangjiakou is a spring maize area. The Tetrachus truncatus Ehara spider mite occurs in all counties and cities, especially in dry years. Maize leaves completely white or even dead early dry, thin lean grains, lower yields, obstacles to corn yield. To this end, we conducted a preliminary study on the occurrence and control of corn spider mites in the spring corn from 1977 to 1979, and put forward the comprehensive prevention and control measures based on the overwintering spider mites on the weeds in early spring. After the application in production , Has achieved initial success. The research results are reported below.