50 %灭蝇胺可溶性粉剂对菜豆美洲斑潜蝇的防治效果评价

2007~2008年田间试验表明，50 %灭蝇胺可溶性粉剂（SP）有效成分用量75.0、112.5和150.0 g·hm^-2，药后3~10 d对菜豆美洲斑潜蝇的防效分别为85.34 %~88.02 %、91.00 %~92.01 %和92.59 %~95.06 %。对照药剂50 %灭蝇胺可湿性粉剂（WP）有效成分用量150.0 g·hm^-2，药后3~10 d的防效为90.01 %~93.71 %。50 %灭蝇胺SP有效成分用量75.0 g·hm^-2处理药后3、7、10 d的防效显著低于对照药剂，而112.5、150.0 g·hm^-2处理药后3、7、10 d的防效与对照药剂差异均不显著。2007年和2008年两年间的防治效果没有显著差异，并与8 a和4 a前的试验结果基本一致，灭蝇胺对美洲斑潜蝇北京种群的敏感性和防效优良。

Evaluation on the Effect of 50 % Cyromazine SP on Controlling Kidney Bean Liriomyza sativae

The efficacy of 50 % cyromazine SP to Liriomyza sativae in the kidney bean field were investigated in 2007 and 2008.The results showed that control effects of 50 % cyromazine SP were 85.34 %-88.02 %,91.00 %-92.01 % and 92.59 %-95.06 % 3-10 days after spraying 75.0 g,112.5 g,150.0 g effective insecticide per hectare,respectively.Control effects of 50 % cyromazine WP were 90.01 %-93.71 % 3-10 days after spraying 150.0 g effective insecticide per hectare.There were no significant differences in control effects between high dosage of 50 % cyromazine SP and 50 % cyromazine WP.The results of 2007 and 2008 didn’t find significant differences in control effect,and basically identical with those of four years and eight years ago.It confirmed that 50 % cyromazine SP was excellent for effective control of Liriomyza sativae in the fields.