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Alfalfa (Medicago sativa) Response to Simulated Herbicide Spray Drift

Published online by Cambridge University Press:  12 June 2017

Kassim Al-Khatib ,
Robert Parker  and
E. Patrick Fuerst
Kassim Al-Khatib
Affiliation:
N. W. Res. and Ext. Cent., Wash. State Univ., Mt. Vernon, WA 98273
Robert Parker
Affiliation:
Irrigated Agric. Res. and Ext. Cent., Wash. State Univ., Prosser, WA 99350
E. Patrick Fuerst
Affiliation:
Dep. Crop and Soils, Wash. State Univ., Pullman, WA 99163
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Abstract

‘Vernal’ alfalfa response was evaluated when chlorsulfuron, thifensulfuron, 2,4-D, glyphosate, bromoxynil, and selected combinations of those herbicides were applied at rates simulating spray drift during the fourth trifoliolate leaf stage following the first cutting in 1990 and 1991. The order of phytotoxicity was 2,4-D > chlorsulfuron > thifensulfuron > glyphosate > bromoxynil. By the end of each growing season, alfalfa had recovered from injury caused by all herbicides except the highest rates of 2,4-D and 2,4-D plus glyphosate. The alfalfa stand was reduced only by 2,4-D and 2,4-D plus glyphosate. All herbicides caused characteristic symptoms, but some specific symptoms were similar among different herbicides or resembled symptoms caused by disease, mineral imbalance, and adverse weather conditions.

Keywords

Bromoxynil, 3,5-dibromo-4-hydroxybenzonitrile, chlorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamideglyphosate, N-(phosphonomethyl)glycinethifensulfuron, 3-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]-2-thiophenecarboxylic acid2,4-D, (2,4-dichlorophenoxy)acetic acidalfalfa, Medicago sativa L.Crop injuryherbicide symptomsbromoxynilchlorsulfuronglyphosatethifensulfuron2,4-D
Type
Research
Information
Weed Technology , Volume 6 , Issue 4 , December 1992 , pp. 956 - 960
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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