摘要
研究表明,棉苗受蚜害后,卷叶株率在38%以下时,棉花产量反而有所增加,可不防治;卷叶株率超过38%时,必须治蚜。此结果可作为棉蚜防治的用药指标。
Cotton yield increases with the increase of the percentage of leafroll plants infected by Aphis gossypii when the percentage is lower than 38%and the yield decreases with the percentage increase when it is higher than38%.
关键词
棉花
棉芽
为害
经济阈值
用药指标
Cotton
Aphis gossypii
Regression experimental design
