浙北单季晚(粳)稻区稻飞虱发生特点与原因探讨

近年来 ,浙北单季晚 (粳 )稻区稻飞虱发生特点为 ,以白背飞虱Sogatellafurcifera (Horvath)和Ni laparvatalugens (St l)褐飞虱为优势种群 ;发生代次多 ,主害代为 3代白背飞虱和 5代褐飞虱 ,少数年份 4代褐飞虱也成为主害代 ;发生偏重 ,但地区和田块间不平衡性突出。其发生主要受外迁虫量、水稻栽增管理和品种特性、夏秋季气候条件和农药防治等因素影响

Occurrence of rice planthoppers in single-cropping of rice fields in northern part of Zhejiang Province

Rice planthoppers in single cropping of rice area in northern part of Zhejiang Province include mostly Sogatella furcifera (Horvath) and Nilaparvata lugens (Stl). Many generations occure in one year.The main damaging generations are the 3rd generation of S. furcifera and the 5th generation of N. lugens .The crop injury levels in regions and fields are determined by the immigration individuals of rice planthoppers,cultivated characteristics of single cropping of rice and cultivated varieties,climatic conditions of summer and autumn, chemical control practice.