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Control of Triazine-Resistant Smooth Pigweed (Amaranthus hybridus) and Common Lambsquarters (Chenopodium album) in No-till Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Edward S. Hagood Jr.
Edward S. Hagood Jr.*
Affiliation:
Dep. Plant Pathol., Physiol., Weed Sci., Va. Polytech. Inst. State Univ., Blacksburg, VA 24061
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Abstract

Field experiments were established to evaluate preemergence and postemergence herbicides for control of triazine-resistant smooth pigweed and common lambsquarters in no-till corn. When applied preemergence, alachlor in the microencapsulated formulation controlled smooth pigweed better than the emulsifiable concentrate formulation and better than either metolachlor or pendimethalin. These herbicides applied preemergence did not control common lambsquarters consistently. Pendimethalin controlled both triazine-resistant species when applied as a sequential treatment of a preemergence and an early postemergence application. Control of triazine-resistant smooth pigweed and common lambsquarters was excellent when dicamba was applied early postemergence in treatments containing alachlor, metolachlor, or pendimethalin applied preemergence and/or early postemergence. Thiameturon and CGA-131036 controlled triazine-resistant smooth pigweed with acceptable crop tolerance. Thiameturon also controlled common lambsquarters, but control was unacceptable with CGA-131036.

Keywords

Alachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(Methoxymethyl)acetamideCGA-131036dicamba, 3,6-dichloro-2-methoxybenzoic acidmetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenaminethiameturon, 3-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino] carbonyl] amino] sulfonyl]-2-thiophenecarboxylic acidcommon lambsquarters, Chenopodium album L. #3 CHEALsmooth pigweed, Amaranthus hybridus L. # AMACHcorn, Zea mays L.AlachlorbromoxynildicambametolachlorpendimethalinthiameturonCGA-131036AMACHCHEAL.
Type
Research
Information
Weed Technology , Volume 3 , Issue 1 , March 1989 , pp. 136 - 142
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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