韶关市早稻白背飞虱成灾特点及相应的控制技术

Convulsion Regulation and Controls of White-backed Planthopper in Early-season Rice

白背飞虱在早稻中有迁入早、虫口上升快、数量大 ,在水稻前、中期为害严重等特点.白背飞虱暴发时 ,二代若虫高峰期虫量与4月份成虫迁入量和迁入频次呈极显著正相关.据此建立了虫害发生程度预测模式 ,经验证 ,1990-2002年平均预测准确率达92.7%.同时根据早稻白背飞虱的发生特点 ,制定出了“重点监测 ,治二压三”的防治策略和与之相应的控制技术.

White-backed planthopper has the characterizes of early migrating,quick rising number and severe demage at earlier and middle stages of early season rice.the nymph number of second generation in peak hour was correlated sig-nificantly and positively with the migrating number and frequency of the adult.Interms of this,a forecast formula of e-mergence grade was established.The mean of forecast accuracy reached92.7%during1990-2002.Accoding to the characters of the pest catastrophe,the strategies of monitoring and focol control on the second and thirdgeneretion of the insect with effective techniques have been set up.