Various chemical treatments were evaluated over two growing seasons for control of triazine-resistant common lambsquarters ( Chenopodium album L. # CHEAL) and for control of a triazine-resistant infestation containing both redroot pigweed ( Amaranthus retroflexus L. # AMARE) and Powell amaranth ( A. powellii S. Wats. # AMAPO). Atrazine [6-chloro- N -ethyl- N′ -(1-methylethyl)-1,3,5-triazine-2,4-diamine], cyanazine {2-[[4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl] amino]-2-methylpropanenitrile}, and metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4 H )-one] provided unsatisfactory control of these biotypes. Satisfactory control of common lambsquarters was obtained with preemergence applications of pendimethalin [ N -(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] or dicamba (3,6-dichloro-2-methoxybenzoic acid), or postemergence applications of dicamba, bromoxynil (3,5-dibromo-4-hydroxybenzonitrile), or bentazon [3-(1-methylethyl)-(1 H )-2,1,3-benzothiadiazin-4(3 H )-one 2,2-dioxide]. Satisfactory control of pigweed was obtained with preemergence applications of alachlor [2-chloro- N -(2,6-diethylphenyl)- N -(methoxymethyl)acetamide] or postemergence treatments of dicamba, bromoxynil, or 2,4-D [(2,4-dichlorophenoxy) acetic acid].
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Fuerst et al. (1986) studied this question.