摘要
应用通径分析方法研究了稻纵卷叶螟为害早稻品种“红优早”的产量损失途径．结果表明：在稻纵卷叶螟为害的三片功能叶中，造成产量损失的主要是剑叶．产量损失主要又是由于不饱满谷粒的增加造成的．长沙地区，当经济损失水平定为１％时，孕穗期稻纵卷叶螟为害“红优早”的经济阈值为：百蔸幼虫２０３头，或卷叶率１９．０６％，或叶片受损指数９．８８６．
The yield-loss caused by Cnaphalocrocis medinalis Guenee on variety
“HongYouzao”at booting stage and its economic threshold were stuided in cage condition in
this pa-per. The yield-loss-forming way was elucidated by path analysis. The results are as
follws:(1) In three injured functional leaves,the injurious uppermost leaf is the main factor
causingyield reduction,yield-loss is greatly due to the increase of non-solid-grams,(2)when the
eco-nomic injury level is 1% in Changsha area,the economic threshold for rice leaffolder on
vari-ety“Hong Youzao”at pregnant heading stage are calculated to be 203 secend instar
larvae per100 plants,or the percentage of leaffold to be 19.06%,or the index of leaf area
consumptionto be 9.886.
关键词
稻纵卷叶螟
病虫害
防治
经济阈值
通径第数分析
Cnaphalocrocis medinalis
pest control methods
economic
threshold
pathcoefficiency analysis
