Effect of combination of pyroxasulfone and metribuzin in maize and soybean intercropping patterns
Pyroxasulfone is a new herbicide registered to be used in wheat field,but it has not been reg-istered for use in soybean or maize field.In order to determine the feasibility of the combination of py-roxasulfone and metribuzin in maize and soybean intercropping patterns,the combined action mode of pyroxasulfone and metribuzin was determined with Gowing method in greenhouse,at the same time,the weed control spectrum of 80％pyroxasulfone·metribuzin water dispersible granule(WDG)and the safe-ty of soybean and corn were tested in greenhouse.The results showed that pyroxasulfone+metribuzin was synergistic in controlling Digitaria sanguinalis,Echinochloa oryzicola and additive in controlling Abutilon theophrasti,Solanum nigrum.Pyroxasulfone·metribuzin 80％WDG was highly effective against six grasses D.sanguinalis,Eleusine indica,Ec.oryzicola,Setaira viridis,Se.faberii,Chloris vir-gata and four broad-leaved weeds Portulaca oleracea,Acalypha australis,Amaranthus retroflexus,Ce-losia argentea with GR50 6.1-21.6 g(a.i.)/hm2 and GR90 16.3-50.5 g(a.i.)/hm2,and slightly effective against Ab.theophrasti,So.nigrum with GR50 53.3,25.4 g(a.i.)/hm2 and GR90 282.1,96.7 g(a.i.)/hm2 re-spectively.It had sound safety to maize and soybean,and the selectivity index was greater than 13.6 be-tween maize and main weeds,than 28.50 between soybean and main weeds.The results indicated that pyroxasulfone could be fully applied with metribuzin in maize and soybean intercropping patterns.
pyroxasulfonemetribuzincombined action modemaize and soybean intercroppingcon-trol efficacysafety
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