摘要
在海盐、临海和金华三地的田间试验评估了50%吡蚜酮WG水分散粒剂对灰飞虱、白背飞虱和褐飞虱的田间防控效果,并用基于经济阈值的稻飞虱化学防治简易判别规则分析经济效益、选择最佳剂量。穗期灰飞虱的试验显示,田间使用75 g a.i..hm-2水分散粒剂(WG)与相同剂量的悬乳剂(SE)防效相当;用50%吡蚜酮水分散粒剂75.0,112.5 g a.i..hm-2处理对稻飞虱药后1～21 d的防效分别达60%～97%;两浓度处理对以褐飞虱为主的稻飞虱药后4～21 d的防效也分别达77%～98%,均符合Logistic方程,最终防效达到98%;2个浓度处理均对稻飞虱有良好的速效性和控制效果,持效期可达21 d左右。根据基于经济阈值的稻飞虱化学防治简易判别规则分析经济效益表明,防治粳稻灰飞虱、籼稻和粳稻中期的灰飞虱、白背飞虱和褐飞虱均以50%吡蚜酮水分散粒剂75 g a.i..hm-2为最佳选择。
Field experiments in three sites in Zhejiang province were carried out for evaluation of efficacy and economic efficiency of formulation and dosage of pymetrozine in controlling rice planthoppers,by economic threshold model-based simple judgment rule of chemical control.Wettable granule（WG） of pymetrozine was as effective as suspension emulsion（SE） with the same rate of 75 g a.i.·hm-2 in controlling the small brown planthopper（SBPH）,Laodelphax striatellus,in rice panicle.Rates of 75 g a.i.·hm-2 and 112.5 g a.i.·hm-2 of 50% pymetrozine WG had efficacies of 60%-97% from 1 to 21 days after treatment（DAT） for controlling SBPH and the white-backed planthopper,Sogatella furcifera,in mid-season of rice growth.Same rates of 50% pymetrozine WG obtained the efficacies of 77%-98% for the brown planthopper,Nilaparvata lugens,from 4 to 21 DAT.The trends of control efficacies for the three planthoppers species in the two experimental sites were similar and could be well-fitted by Logistic models against DAT and reached the final maximum value of 98%,suggesting both the rates of the WG formulation of pymetrozine have fast and sustainable controlling effect for at least 21 days.The economic threshold model-based simple judgment rule of chemical control indicated that 50% pymetrozine WG in a rate of 75 g a.i.·hm-2 is the optimal selection in control of the three species of rice planthoppers in both japonica rice and indica hybrid rice.
出处
《浙江农业学报》
CSCD
北大核心
2013年第4期808-813,共6页
Acta Agriculturae Zhejiangensis
基金
973项目(2010CB126200)
支撑项目(2012BAD19B01)
公益性农业行业项目(201003031)
关键词
吡蚜酮
稻飞虱
经济阈值模型
化学防治
pymetrozine
rice planthopper
economic threshold model
chemical control
