摘要
以不同的测定方法对本省不同世代区玉米螟为害玉米产量损失的研究表明,一代区和不完全二代区采用大样本单测回归法。一代区玉米单株每增加1头幼虫,单株产量损失3.48克,损失率2.65％。不完全二代区玉米单株每增加1头幼虫,单株产量损失3.78克,损失率3.0％。二代区采用改进的小区对比法。第一代1头幼虫,产量损失率5.15％;第二代1头幼虫,产量损失率2.35％;一、二代混合,1头幼虫产量损失率3.38％。以玉米螟产量损失为依据,提出了一代和不完全二代区的防治指标及二代区的防治策略。
The damages of corn borer to maize yields in different generation num-ber area in Heilongjiang Province were tested by different methods fortwo years.The results showed that: 1. By large sample inference,the yield loss rate increased with the lar-vae number in one generation area and incomplete two generation areawere 3.48 g.or 2.65% per larva,and 3.67 g.or 3.0% per larva,respec-tively. 2. By improved plots comparison,in two generation area,the yield lossrate of first,second,and mixed generations were 5.15%,2.35%,and3.38%,respectively. Based on these results,the economic thresholds of corn borer in onegeneration area and incomplete two generation area,and control tactic intwo generation area were proposed.
出处
《植物保护学报》
CAS
CSCD
北大核心
1989年第4期265-268,共4页
Journal of Plant Protection
