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Comparative Efficacy of Two Formulations of Alachlor and Metolachlor

Published online by Cambridge University Press:  12 June 2017

J. Peyton Doub
Eastern Shore Agric. Exp. Stn., Painter, VA 23420
Henry P. Wilson
Eastern Shore Agric. Exp. Stn., Painter, VA 23420
Kriton K. Hatzios
Dep. Plant Path., Physiol., and Weed Sci., Virginia Polytech. Inst, and State Univ., Blacksburg, VA 24061


The efficacies of microencapsulated (ME) and emulsifiable concentrate (EC) formulations of alachlor [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide] and metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] were compared in petri dish and soil bioassays. At equimolar concentrations, EC-alachlor inhibited shoot growth of barnyardgrass [Echinochloa crus-galli (L.) Beauv. # ECHCG], large crabgrass [Digitaria sanguinalis (L.) Scop. # DIGSA], and fall panicum (Panicum dichotomiflorum Michx. # PANDI) more than ME-alachlor. ME- and EC-metolachlor caused similar effects on the three grass weeds tested. ME- and EC-alachlor in combination caused effects on barnyardgrass shoot growth intermediate to results with either formulation alone. Air-drying and remoistening of alachlor-treated filter paper or soil before sowing barnyardgrass or fall panicum caused greater shoot length and fresh weight reduction than ME-alachlor that was not dried.

Weed Control and Herbicide Technology
Copyright © 1988 by the Weed Science Society of America 

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