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2003年以来稻纵卷叶螟Cnaphalocrocis medinalis(Guene)在全国连年大发生,给我国水稻生产造成严重的损失。广西永福县位于湘桂走廊要冲,属于南岭双季稻区,该稻区是江南和江淮稻区的主要虫源地之一,分析其早稻田稻纵卷叶螟的大发生的原因,对江南和江淮稻区稻纵卷叶螟的预测预报和防治工作意义重大。本文分析了1975～2008年永福县的种植制度的变化和5月、6月降雨量和日平均气温资料,以及1989～2008年稻纵卷叶螟早期迁入量,结果表明:5月、6月降雨量、日平均气温和种植制度对稻纵卷叶螟的大发生影响不显著,第3代(主害代)高峰日蛾量与稻纵卷叶螟的发生程度呈极显著正相关,(r=0.719,P=0.0035),因此,早期迁入量大是该地区稻纵卷叶螟2003以来连年大发生的主要原因。
Since 2003, the Cnaphalocrocis medinalis (Guenéee) occurred in successive years throughout the country, causing serious losses to China’s rice production. Yongfu County, Guangxi Province is located in the Xiang-Gui corridor to red, belongs to the Nanling double cropping rice area, which is one of the main source of insects in Jiangnan and Jianghuai areas, and analyzes the causes of its occurrence in the early rice paddy, And Jianghuai area rice leaf roller forecasting and prevention and control work is of great significance. This paper analyzes the changes of cropping system and rainfall in May and June in Yongfu County from 1975 to 2008 as well as the daily average temperature data of the rice leafroller from 1989 to 2008. The results show that in May, 6 The effects of monthly rainfall, average daily temperature and cropping system on the occurrence of C. medinalis were insignificant. There was a significant positive correlation between the monthly moth abundance and the occurrence of C. medinalis in the third generation (the main generation) (r = 0.719, P = 0.0035). Therefore, the large amount of early immigration occurred in successive years since 2003 in the area.