THE HISTORY AND PRESENT STATUS OF HERBICIDE - RESISTANT WEED BIOTYPES IN SOUTH CAROLINA COTTON

E.C. Murdock, A.C. York, and B.J. Gossett

ABSTRACT

The presence of dinitroaniline (dna)-resistant goosegrass, organic arsenical-resistant common cocklebur, and dna-resistant Palmer amaranth in South Carolina cotton fields was confirmed in 1982, 1985, and 1989, respectively. Dinitroaniline-resistant goosegrass is now prevalent throughout South Carolina cotton growing area, and goosegrass is currently the ninth most troublesome weed in cotton. Organic arsenical-resistant common cocklebur is not. Included among the ten most troublesome weeds in South Carolina cotton. Palmer amaranth was not included among the ten most troublesome weeds in South Carolina cotton prior to 1992, but is now the top-ranked problem weed. This is attributed to the a appearance of a dna-resistant Palmer amaranth biotype.





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Document last modified July 8, 2004