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Effect of Rainfall on Glyphosate Plus 2,4-D Performance on Echinochloa crus-galli

Published online by Cambridge University Press:  12 June 2017

Gail A. Wicks  and
Gordon E. Hanson
Gail A. Wicks
Affiliation:
Dep. Agron., West Cent. Res. and Ext. Ctr., Univ. Nebraska, North Platte, NE 69101-9495
Gordon E. Hanson
Affiliation:
Dep. Agron., West Cent. Res. and Ext. Ctr., Univ. Nebraska, North Platte, NE 69101-9495
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Abstract

Barnyardgrass is a problem in winter wheat fields in the central Great Plains following harvest. Glyphosate plus 2,4-D efficacy on barnyardgrass with or without atrazine was investigated under various watering events at three sites in west central Nebraska. Two experiments were initiated at each site. One experiment dealt with rainfall and the other rainfall plus irrigation. Main plots in stubble fields infested with barnyardgrass were sprayed with glyphosate plus 2,4-D at 0.4 plus 0.7, 0.5 plus 0.8, and 0.6 plus 1.0 kg ae ha−1 alone and with 2.2 kg ai ha−1 atrazine. Barnyardgrass was under drought stress in unwatered areas in 1991 at two sites, but the 1993 site was waterlogged. Glyphosate plus 2,4-D at 0.6 plus 1.0 kg ha1 controlled 62, 99, and 100% of the barnyardgrass at the three sites 30 DAT. Nevertheless, control was reduced to 48, 88, and 35% when atrazine was combined with glyphosate plus 2,4-D. Poorest control came when plants were under stress from drought or waterlogging and atrazine was included in the spray solution. In subplots barnyardgrass plants in a 0.8 m2 area were watered 6, 3, or 1 d before spraying and 1, 4, 7, or 11 d after spraying. By watering drought-stressed barnyardgrass 6 d before spraying, control generally was similar or better than with later watering dates. Watering 6 d before spraying with glyphosate plus 2,4-D plus atrazine at 0.6 plus 1.0 plus 2.2 kg ha−1 reduced but did not eliminate antagonism from atrazine.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamineglyphosate, N-(phosphonomethyl)glycine2,4-D, (2,4-dichlorophenoxy)acetic acidbarnyardgrass, Echinochloa crus-galli L. Beauv. #3 ECHCGwinter wheat, Triticum aestivum L.Antagonismecofallowno-tillagewater stressatrazineEchinochloa crus-galliECHCG
Type
Weed Management
Information
Weed Science , Volume 43 , Issue 4 , December 1995 , pp. 666 - 670
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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