不同用药方案对防治水稻主要害虫的效果评价

通过田间试验研究不同用药方案对稻飞虱和稻纵卷叶螟防治效果、田间节肢动物群落多样性及水稻产量的影响.结果表明,施用噻嗪酮和氯虫苯甲酰胺(用药方案 A)处理田稻飞虱虫口减退率和防治效果均显著低于施用吡虫啉和毒死蜱(用药方案B)处理田,用药方案A处理田卷叶率显著低于用药方案B.用药方案A田间节肢动物群落Shannon-Wiener指数(H′)高于用药方案B,优势集中性指数(C)低于用药方案B,水稻产量比用药方案B增产24%.说明用药方案A对稻纵卷叶螟具有较好的控制作用,对田间节肢动物群落影响较小,并且能够显著提高水稻产量.

Assessment on Efficacies of Different Regimen against Main Pests in Rice Fields

The influences of different regimen on main pests(rice planthoppers and Cnaphalocrocis medinalis),diversity of arthropod communitnies and rice yields were researched through field experiments.The results showed that the population decline rates and control effects of rice planthoppers in the plots using buprofezin and chlorantraniliprole(Regimen A) were significantly lower than those using imidacloprid and chlorpyrifos(Regimen B).The percentages of folded leaves(%) in the Regimen A plots were also significantly lower than those in Regimen B plots.The Shannon-Wiener index in Regimen A plots was higher than that in Regimen B plots,but the dominance index was lower than that in Regimen B plots,however,neither showed significant differences.The yield of Regimen A was 24 percent higher than that of Regimen B.It was apparent that Regimen A had a better control action on C.medinalis,with little effects on the arthropod community,and had higher yields than Regimen B.