苯唑草酮及其混剂防治玉米田杂草的效果评价

Evaluation of Control Effect of Topramezone and Its Mixture on Weeds in Cornfield

为扩大苯唑草酮的使用范围，降低杂草抗药性风险，提高玉米田苗后杂草综合防效，将30％苯唑草酮SC与多种除草剂混用进行玉米田苗后杂草的防除效果研究。结果表明：30％苯唑草酮SC对玉米田优势杂草有良好的防效，有效成分45．36～60．48g／hm。对禾本科杂草的株防效为86．16％～97．089／6，对阔叶杂草的株防效为63．85％～86．53％；30％苯唑草酮SC25．2g／hm~与90％莠去津SC675～945g／hmz混用对阔叶杂草的株防效高于30％苯唑草酮SC单剂，为71．46％～88．37％，且能提高对总草的鲜质量防效。30％苯唑草酮SC与90％莠去津SC混用，可以在减少苯唑草酮用量的情况下提高对阔叶杂草的防效，从而降低杂草抗药性风险。

To expand the use scope of topramezone, reduce the risk of drug resistance,and improve comprehensive control efficiency on postemergence weeds in cornfield,30 % topramezone SC and a variety of herbicides were mixed to control weeds, and their control effects were evaluated. The results showed that 30 % topramezone SC had good control effect for dominant species of weeds in cornfield. When its active ingredient was 45.36-60. 48 g/ha,the control effect was 86.16%- 97.08% for gramineae weeds and 63.85%-86.53% for broad-leaved weeds based on the number of weeds. When 25.2 g/ha of 30% topramezone SC was mixed with 675-945 g/ha of 90% at- razine SC,the control effect for broad-leaved weeds was 71.46%-88. 370% based on the number of weeds,higher than the single agent of 30% topramezone SC. The mixture could also improve the control effect for total weeds based on the fresh weight. Hence,the amount of 30% toprame- zone SC can be reduced when used with 90 % atrazine SC together,thereby reducing the drug re- sistance risk of weeds.