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小麦套种玉米是宁夏灌区和新垦区最主要的作物种植模式之一。近年来 ,玉米病虫害发生严重 ,其中玉米叶螨、大小斑病、霜霉病造成玉米每年 2 3%～ 37%的产量损失。 1998～ 2 0 0 0年根据套种玉米主要病虫害的发生规律和为害特点 ,建立了玉米病虫害综合防治技术体系 ,每年防治示范面积 0 .78万hm2 ,有效地控制了玉米病虫的发生与为害 ,经济效益比为 1∶7.6 7,社会和生态效益显著。
Wheat intercropping corn is one of the most important crop planting patterns in Ningxia Irrigation and Reclamation areas. In recent years, maize pests and diseases seriously, including corn spider mites, spot disease, downy mildew caused maize annual yield of 2-3% to 37%. According to the occurrence and damage characteristics of the main pests and diseases of intercropping maize from 1998 to 2000, a comprehensive prevention and control system for maize diseases and pests was set up. The demonstration area of prevention and treatment was 0.788 million hm2 per year, effectively controlling the occurrence and damage of maize pests, Economic efficiency ratio of 1: 7.6 7, significant social and ecological benefits.