摘要
根据田间对比试验结果 ,嘉兴地区单季稻田二代二化螟和五 ( 3 )代稻纵卷叶螟混合发生时 ,其复合为害的产量损失率 :y =0 .0 1 59X1+0 .2 4 56X2 -0 .2 2 2 7(式中X1为二化螟枯鞘团密度 ,X2 为稻纵卷叶螟虫口密度 )。按照当前水稻生产水平 ,计算得经济允许损失L =2 .3 4 64。由满足 0 .0 1 59X1+0 .2 4 56X2 -0 .2 2 2 7=2 .3 4 64 ,测得二化螟和稻纵卷叶螟混合为害的
The results of the field test show that the loss rate of the complex damage with the 2nd generation of rice stem borer and the 5 th generation of rice leafroller is y=0.015?9x 1+0.245?6x 2-0.222?7 . In the formula, x 1 means the density of wilt sheath damaged by rice stem borer, x 2 means the density of rice leafroller. Based on present rice production level. The economical loss( L ) is 2.346?4. Based on 0.015?9x 1+0.245?6x 2-0.222?7=2.346?4, one set of developmental complex control index of the complex damage with rice stem borer and leafroller can be calculated.
出处
《植保技术与推广》
2000年第4期11-12,共2页
Plant Protection Technology and Extension
