摘要
据调查 ,2 0 0 2～ 2 0 0 3年安徽省广德县的稻纵卷叶螟、白背飞虱初见期、迁入主峰日较历年平均值显著提前 ,仍以第 2代为主害代次外 ,大发生年第 1代往往即可达到防治指标 ,第 3代仍居留为害。褐飞虱首次出现第 4代危害单季稻记录。 3种迁飞性害虫在单季稻上居留时间延长 ,危害代次增多。稻纵卷叶螟、白背飞虱时空分布差异增大 ,多种影响因子则有利于害虫的发生。
The dates of starting occurrence and peak immigration of rice leaffolder (RLF) and the whitebacked planthopper (WBPH) in 2002 and 2003 were remarkably earlier than the average of observed years. The second generation was the main generation causing serious damage. The first generation in the year of pest outbreaks reached the level of economic threshold for control. The third generation still could damage rice plants. There was the first record that the fourth generation of the brown planthopper could damage one-season rice. All of three migrating insect pests prolonged staying on one-season rice and caused damage with several generations. The differences in spatio-temporal distributions of RLF and WBPH enlarged and several factors influencing pest populations were favorable to its occurrence.
出处
《昆虫知识》
CSCD
北大核心
2004年第6期578-582,共5页
Entomological Knowledge
