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Effects of Sequential Herbicide Treatments on Weeds and Soybeans

  • B. J. Johnson (a1)

Abstract

Sequential herbicide treatments of 3-[p-(p-chlorophenoxy)-phenyl]-1,1-dimethylurea (chloroxuron) with S-propyl dipropylthiocarbamate (vernolate) controlled weeds early in the season in soybeans (Glycine max (L.) Merr. ‘Dare’ or ‘Bragg’) better than when chloroxuron was applied in sequence with either α,α,α-trifluoro-2,6-dinitro-N,N dipropyl-p-toluidine (trifluralin) or 4-(methylsulfonyl)-2,6-dinitro-N,N-dipropylaniline (nitralin). The control of weeds late in the season was enhanced with split applications of 3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea (linuron) or 2,4-bis(isopropylamino)-6-(methylthio)-s-triazine (prometryne) when applied to plots previously treated with chloroxuron as early postemergence and trifluralin, nitralin, or vernolate applied preplant. In 1969 nitralin injured soybeans, and reduced stands and seed yields significantly more than trifluralin or vernolate. In 1970 sequential treatments of prometryne with chloroxuron and vernolate were more phytotoxic to soybeans than were the same postemergence treatments when applied with nitralin and trifluralin.

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References

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1. Johnson, B. J. 1970. Effects of nitralin and chloroxuron combination on weeds and soybeans. Weed Sci. 18:616618.
2. Johnson, B. J. 1970. Performance of herbicides on weeds and soybeans in the Piedmont and Limestone Valley Regions of Georgia. Georgia Agr. Exp. Sta. Res. Rep. 79:136.
3. Robinson, C. W. and Gossett, B. J. 1969. Influence of vernolate on the selectivity of chloroxuron with surfactant for weed control in soybeans. Proc. So. Weed Sci. Soc. 22:120.
4. McWhorter, C. G. and Schweizer, E. E. 1964. Effectiveness of a postemergence split-application of herbicides for weed control. Proc. So. Weed Conf. 17:171183.

Effects of Sequential Herbicide Treatments on Weeds and Soybeans

  • B. J. Johnson (a1)

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