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Consecutive Annual Applications of Alachlor and Metolachlor to Continuous No-Till Corn (Zea mays)

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
Thomas E. Hines
Eastern Shore Agric. Exp. Stn., Painter, VA 23420
Kriton K. Hatzios
Dep. Plant Pathol., Physiol., and Weed Sci., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061


Consecutive annual applications 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 made to continuous no-till corn (Zea mays L. ‘Pioneer 3184’ in 1982 and 1983, ‘Pioneer 3744’ in 1984, and ‘Pioneer 3378’ in 1985 to 1987). In a 5-yr study, control of the dominant annual grass species, large crabgrass [Digitaria sanguinalis (L.) Scop. # DIGSA], by alachlor declined to less than 50% by the fifth year. Control of large crabgrass by metolachlor remained greater than 80% throughout the study but metolachlor allowed the establishment of a greater fall panicum (Panicum dichotomiflorum Michx. # PANDI) population in this and an additional 3-yr study than in chloroacetamide-free checks. In the 3-yr study in which giant foxtail (Setaria faberi Herrm. # SETFA) was dominant, annual applications of metolachlor and a microencapsulated formulation of alachlor provided better control in the second year than the emulsifiable concentrate formulation of alachlor, but formulation differences diminished in the third year.

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

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