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病虫草害发生的新动向镇江丘陵稻区种植杂交稻200～250万亩,约占水稻总面积的33～40%.杂交稻在生育过程中,受到多种病、虫、杂草为害,影响产量很大.一般年份因病虫为害(不包括草害)损失稻谷约两亿斤,减产8～10%.据近几年调查结果,杂交稻病、虫、草的发生和为害出现了新的动向,主要表现在四个方面.(一)外源性害虫上升为主要害虫七十年代以来,白背飞虱、褐稻虱和稻纵卷叶螟等外源性害虫,大发生频率增加,为害逐年加重,已成为杂交稻中后期的主要虫害.在当前防治工作中,应以这三种迁飞性害虫为主,结合防治纹枯病,制订防治策略.
New trends in the occurrence of pests, diseases and weeds Occurrence of 200-250 million hectares of hybrid rice in Zhenjiang hilly area, accounting for 33-40% of the total area of rice. Hybrid rice is harmed by various diseases, insects and weeds in the process of reproduction Yield is very large .In general years due to pest damage (not including grass damage) about two hundred million kilograms of rice loss, cut 8 to 10% .According to the survey results in recent years, hybrid rice disease, insects, grass and the emergence of a new damage , Mainly in four aspects: (1) Exogenous pests rise to pests Since the 1970s, exogenous pests such as Sogatella furcifera, Nilaparvata lugens and Cnaphalocrocis medinalis have increased in frequency , Pests increase year by year, has become the main pests and diseases in the middle and late hybrid rice.In the current prevention and treatment work, these three kinds of migratory pests mainly should be combined with prevention and control of sheath blight, to develop prevention and control strategies.