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Soil Temperature as an Application Indicator for Perennial Ryegrass Control

Published online by Cambridge University Press:  20 January 2017

Kendall C. Hutto ,
James M. Taylor  and
John D. Byrd Jr
Kendall C. Hutto*
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
James M. Taylor
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
John D. Byrd Jr
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
*
Corresponding author's E-mail: [email protected]
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Abstract

Research trials conducted at two locations in the spring of 2004 evaluated the effect of soil temperature as an indicator for application timings of certain sulfonylurea herbicides for perennial ryegrass control while maintaining acceptable turfgrass quality during bermudagrass spring transition. Herbicide application timings began when soil temperatures reached 17 C (April 14, 2004). Greater perennial ryegrass control 4 wk after initial treatment (WAIT) was achieved when sulfonylurea herbicides were applied at 26 C soil temperature compared to 17 or 21 C. Bermudagrass density 6 WAIT increased with treatments applied at 26 C soil temperature compared to cooler soil temperatures. There was a decrease in overall turfgrass quality 2 WAIT when treatments were applied at 17 C. However, by 4 WAIT all application timings provided overall turfgrass quality comparable to the untreated control. Acceptable turfgrass quality and maximum perennial ryegrass control was achieved by delaying transition-aid herbicide applications until soil temperatures reached 26 C and growing conditions were more conducive to bermudagrass growth.

Keywords

Chlorsulfuron, flazasulfuron, foramsulfuron, metsulfuron, rimsulfuron, trifloxysulfuron-sodium, perennial ryegrass, Lolium perenne L. LOLPE, common bermudagrass, Cynodon dactylon (L.) Pers. CYNDA, bermudagrass, Cynodon dactylon Pers. × transvaalensis Burtt-Davy ‘Tifgreen’Sulfonylureatransition aid
Type
Weed Management — Other Crops/Areas
Information
Weed Technology , Volume 22 , Issue 2 , June 2008 , pp. 245 - 248
Copyright
Copyright © Weed Science Society of America 

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