玉米叶螨自 1989年在宁夏平罗、陶乐等县发生后，现已在宁夏全区各地普遍发生。 1999年发生面积近 10万 hm~2，给玉米生产带来严重为害。一般年份损失率 15％左右，严重发生年损失率达 20％以上。研究其发生规律、预测预报办法和防治方法，是生产上亟须解决的问题。从 1996年开 Corn spider mite since 1989 in Ningxia Ping Luo, Tao Le County occurred, now in all parts of Ningxia generally occur. In 1999, an area of ​​nearly 100,000 hm ~ 2 occurred, causing serious damage to corn production. Average annual loss rate of about 15%, a serious annual loss rate of 20% or more. Studying the law of its occurrence, forecasting and forecasting methods and prevention and cure methods are problems which are urgently needed to be solved in production. Opened from 1996