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Effect of Prior Year's Weed Control on Herbicide Effectiveness in Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Robert G. Hartzler  and
Greg W. Roth
Robert G. Hartzler
Affiliation:
Dep. Agron., The Pennsylvania State Univ., Univ. Park, PA 16802
Greg W. Roth
Affiliation:
Dep. Agron., The Pennsylvania State Univ., Univ. Park, PA 16802
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Abstract

Three levels of weed control (0, 70, and 100%) were maintained in 1989 during corn production at two sites. Weed control in 1990 with a premix formulation of metolachlor and atrazine was directly related to 1989 control levels. Herbicides generally were more effective in conventional tillage than in no-tillage. In no-tillage, giant foxtail control in 1990 averaged 59% following 100% control in 1989 compared to 15% following 0% weed control. At one location, tillage minimized the impact of the prior year's weed control with herbicides providing greater than 85% control in conventional tillage regardless of prior history. In no-tillage, weed control of 85% or better was obtained only following 100% control the previous year.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidecorn, Zea mays L.common lambsquarters, Chenopodium album L. # CHEALfall panicum, Panicum dichotomiflorum Michx. # PANDIgiant foxtail, Setaria faberi Hermm. # SETFAsmooth pigweed, Amaranthus hybridus L. # AMACHtillageChenopodium albumPanicum dichotomiflorumSetaria faberiAmaranthus hybridusAMACHCHEALPANDISETFA
Type
Research
Information
Weed Technology , Volume 7 , Issue 3 , September 1993 , pp. 611 - 614
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

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