中粳稻区白背飞虱灾变特点及其测报技术

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。

THE DISASTER CHARACTERISTIC AND FORECAST OF WHITE-BACKED PLANTHOPPER IN INTERMEDIATE KENG RICE REGION

The data of systemic monitoring on white-backed planthopper and brown planthopper in Tongzhou since 1978 were analysised. The result showed that the white-backed planthopper had disaster characteristics such as great number of ingoing adult, more times of reproduction, in intermediate keng rice region in north of Jiangsu province, The immigrating generation is the main damage source, which caused the white-backed planthopper alternated with brown planthopper on occurring and spatial distribution. The number of the second generation nymphae in peak is prositive correlative to the number of the first generation that occurred before 10th to 15th, July. The correlation is highly significant. Based on the data, a forecast formula was established and the forecast index of occurring level was suggested. The forecast accuracy was close to 85%.