几种除草剂的生物测定及复配效应研究

A study on bioassay of several herbicides and interaction of mixtures:

用培养皿法和盆栽喷雾法分别测定了几种除草剂对稗草 (Echinochloacrusgalli)的生物活性 ,并测定了 2个复配组合的增效效应。试验表明 ,6种除草剂对稗草芽长抑制活性由高到低依次为 :乙草胺、苯噻酰草胺、异丙甲草胺、千金、农美利、苄嘧磺隆 ;3种除草剂对稗草 2叶和 4叶期幼苗致死活性大小依次为 :农美利、千金、苄嘧磺隆 ;苯噻酰草胺与苄嘧磺隆复配对稗草芽长抑制的相互作用为独立相加 ,千金与苄嘧磺隆复配对稗草芽长抑制也为相加作用或稍有增效作用 ,但对稗草

Activities of several herbicides to barnyardgrass (Echinochloa crusgalli) were determined by dish dipping and pot spraying methods, and interaction of mixtures was assessed. The result showed the inhibition of 6 herbicides to barnyardgrass bud is in the following order: acetochlor > mefenacet > metolachlor > cyhalofop > bispyribac sodium > bensulfuron methy, and the order for lethal activity to barnyardgrass at 2 leaf stage and 4 leaf stage is: bispyribac sodium > cyhalofop > bensulfuron methy. It also showed there is an addition in inhibiting weed bud in the mixture of mefenacet + bensulfuron methy, and also addition or slight synergism in the mixture of cyhalofop + bensulfuron methyl, but the mixture of cyhalofop + bensulfuron methyl seems to be antagonic in killing weed plant.