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Optimal Glyphosate Application Time for Control of Foxtail Barley (Hordeum jubatum)

Published online by Cambridge University Press:  12 June 2017

Jeffery S. Conn  and
Richard E. Deck
Jeffery S. Conn
Affiliation:
USDA-ARS, 309 O'Neill Bldg., P.O. Box 757200, University of Alaska, Fairbanks, AK 99775-7200
Richard E. Deck
Affiliation:
USDA-ARS, 309 O'Neill Bldg., P.O. Box 757200, University of Alaska, Fairbanks, AK 99775-7200
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Abstract

Optimal time of application of the isopropylamine salt of glyphosate for long-term control of foxtail barley was studied near Delta Junction, AK in 1992 and 1993. Applications of either 0.6 or 1.1 kg/ha of glyphosate with 2.2 kg/ha of ammonium sulfate and 0.5% (v/v) nonionic surfactant were made to different foxtail barley plots at approximately 2-wk intervals from May to September. Control was rated in July of the year following application. The 0.6 kg/ha rate produced ≤ 60% control on all application dates. At 1.1 kg/ha, foxtail barley control was best from applications made between early August and mid-September. May and mid-June applications provided up to 80% control in 1993 but ≤ 50% control in 1992. For both rates, applications made from late June through July, during foxtail barley flowering and seed fill, consistently provided little control (< 50%).

Keywords

Glyphosate, N-(phosphonomethyl)glycinefoxtail barley, Hordeum jubatum L. # HORJUPhenologytime of application
Type
Research
Information
Weed Technology , Volume 9 , Issue 2 , June 1995 , pp. 267 - 269
Copyright
Copyright © 1995 by the Weed Science Society of America 

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