论文部分内容阅读
分析１９７８年以来通州市白背飞虱和褐飞虱的系统监测资料，白背飞虱在苏北中粳稻区具有成虫迁入量大，增殖倍数高，迁入成虫繁殖的子代即为主害代，与褐飞虱在发生时期和空间分布上此起彼伏等暴发成灾特点。白背飞虱暴发期二代若虫高峰期虫量，与一代７月１０日、１５日前虫量极显著正相关。据此建立预测式，提出发生程度预测指标，预测准确率达８５％以上。
Based on the systematic monitoring data of whitebacked planthopper and brown planthopper in Tongzhou City since 1978, the white-backed planthopper (Sogatella furcifera) possesses a large influx of adult population and high multiplication rate in middle Japonica rice area of northern Jiangsu Province, , And the brown planthopper occurred in the period and the spatial distribution of one after another outbreak of disaster characteristics. The number of second-generation nymphs during the outbreak of Sogatella furcifera was extremely significantly positively correlated with the number of insects on July 10 and 15. Based on this, a predictive formula is established and a prediction index of occurrence degree is proposed, and the prediction accuracy rate reaches above 85%.