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

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.

Keywords

Microencapsulated formulationsDigitaria sanguinalisEchinochloa crus-galliPanicum dichotomiflorumDIGSAECHCGPANDI
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 36 , Issue 2 , March 1988 , pp. 221 - 226
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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