Proportion screening and control effect of the combined pendimethalin,prometryn and flumioxazin against weeds in tigernut field
In order to evaluate the rationality and the control effect of pendimethalin,prometryn and flumioxazin in combination on weeds and safety to Cyperus esculentus var.sativus,a series of trials were conducted based on the pesticides guidelines for laboratory bioactivity test and guidelines for the efficacy trials of herbicides against weeds in soybean field.It was found that the combined effect of pendimethalin,prometryn and flumioxazin presented to be additive or synergistic against three weeds,Echinochloa crus-galli,Abutilon theophrasti and Chenopodium album.When the mixing ratio of the three was 30∶30∶1,the combined effect was synergistic.At this ratio,pendimethalin·prometryn·flumioxazin 36.6％SC had good control effect on annual weeds in C.esculentus var.sativus field,and the test dose was within the range of 1 647.0-1 921.0 g/hm2,which was safer than the others for the emergence and growth of C.esculentus var.sativus.The control efficacy on annual weeds 40 days after application was 91.3％-97.7％.Thus,it is feasible to research and develop new herbicides by the combination of pendimethalin,prometryn and flumioxazin,which could expand the herbicidal spectrum and the application scope,and could be used for weed control in C.esculentus var.sativus field at the recommended dosage of 1 647.0-1 921.0 g/hm2.
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