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Absorption, Translocation, and Phytotoxicity of Glyphosate in Bulbous Oatgrass (Arrhenatherum elatius var. bulbosum)

Published online by Cambridge University Press:  12 June 2017

Karin Tanphiphat  and
Arnold P. Appleby
Karin Tanphiphat
Affiliation:
Dep. Crop Sci., Oregon State Univ., Corvallis, OR 97331
Arnold P. Appleby
Affiliation:
Dep. Crop Sci., Oregon State Univ., Corvallis, OR 97331
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Abstract

Efficacy of glyphosate on bulbous oatgrass, a creeping perennial grass, was investigated in greenhouse and growth chamber studies. Glyphosate at 1.2 and 2.5 kg ae ha−1 significantly reduced corm formation and corm viability. Glyphosate controlled bulbous oatgrass when applied at the 4- to 5- or 6- to 7-leaf stage. With 2.5 kg ha−1, a 24-h period between glyphosate application and removal of the shoots was sufficient to cause maximum reduction in regrowth. Total amount of 14C translocated out of leaves treated with radiolabeled glyphosate (1.0 kg ha−1 total glyphosate) did not differ among growth stages, but more 14C accumulated in the dormant corms when glyphosate was applied at the 2- to 3-leaf stage than at the 4- to 5- or 6- to 7-leaf stages. Lack of correlation between maximum plant injury and glyphosate accumulation in corms is not understood but may be related to differences in application method in the two studies.

Keywords

Glyphosate, N-(phosphonomethyl)glycine, isopropylamine saltbulbous oatgrass, Arrhenatherum elatius (L.) Beauv. ex J. & C. Presl var. bulbosum (Willd.) Spenn. # ARRELTall oatgrassherbicide absorptiondormant cormsARREL
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 38 , Issue 6 , November 1990 , pp. 480 - 483
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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