病虫害预测预报是综合防治的基础,是实现及时、有效地控制病虫危害,减轻损失,夺取丰收的重要前提。但是,由于预测预报既受病虫本身特性及作物栽培条件的影响,又受气象因素的制约,所以目前我们对一些突发性重大病虫的监测能力还较低,预报水平也不够高,因而常使局部地区的粮棉生产受到严重危害。为了更好地总结和积累经验,现将1989年和1990年主要农作物的病虫发生及预报情况进行总结和评估,以便找出差距,不断提高对病虫 Prediction of pests and diseases is the basis of comprehensive prevention and control, and an important prerequisite for achieving timely and effective control of pests and diseases, reducing losses and seizing good harvests. However, as the prediction and forecasting is affected not only by pest and disease characteristics and crop cultivation conditions, but also by meteorological factors, at present, we are still in a low capacity to monitor some major pests and diseases and the forecast level is not high enough Often, grain and cotton production in some areas is seriously harmed. In order to better summarize and accumulate experience, the occurrence and forecast of pests and diseases of major crops in 1989 and 1990 are summarized and evaluated in order to find out the gaps and continuously improve the control of pests and diseases