探讨甘蔗螟虫的化学防治,为筛选高效的防治药剂提供科学依据.采用蔗茎浸渍法测定了噻虫嗪、杀虫单及其混配对黄螟幼虫的室内毒力.结果表明噻虫嗪和杀虫单复配表现出明显的增效作用,噻虫嗪与杀虫单比值为1∶18时增效作用最显著,共毒系数为133.43.根据最佳配比配制成3.8％颗粒剂进行防治甘蔗螟虫的田间试验,结果表明3.8％杀虫单·噻虫嗪颗粒剂制剂用量55、70 kg/hm2施药90天后的防效分别为80.1％、85.4％,可作为防治甘蔗螟虫替代农药.

[Objective]The aim of the present study was to determine the efficiency of 73% mixed MCPA-Na,ametryn and diuron WP on controlling weeds in sugarcane field.[Method]Different herbicides(56% MCPA-Na SP 840 a.i.g/ha,80% ametryn WP 1440 a.i.g/ha,80% diuron WP 1440 a.i.g/ha) and their different concentrations(876,1314,1752 and 2628 a.i.g/ha) were used to control weeds in the sugarcane fields,with water as the control.The controlling effects were investigated after 20 and 40 d of spraying.[Result]The controlling effects of 73% MCPA-Na,ametryn and diuron WP on plant and fresh weight were higher than 90.00% after 20 and 40 d of spraying.The weedicide application @ 876-2628a.i.g/ha resulted in control of most of the monocotyledonous and dicotyledonous weeds in sugarcane field,and showed better controlling effects compared to spraying single dose of 56% MCPA-Na SP,80% ametryn WP and 80% diuron WP.[Conclusion]73% mixed MCPA-Na,ametryn and diuron WP @ 1314-1752 a.i.g/ha may be recommended to control weeds in sugarcane field.