期刊论文

ECONOMIC THRESHOLD AND PATH AN-ALYSIS FOR YIELD-LOSS CAUSED BY Cnaphalocrocis medinalis Guenee DAMAGE

中文

湖南农业大学学报(自然科学版)

1007-1032

1995

02

143-146

10.13331/j.cnki.jhau.1995.02.009

本校为其他机构

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 Y...