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Effect of Atrazine and Mesotrione on Centipedegrass Growth, Photochemical Efficiency, and Establishment

Published online by Cambridge University Press:  20 January 2017

J. Scott McElroy  and
Robert H. Walker
J. Scott McElroy*
Affiliation:
Auburn University, 201 Funchess Hall, Auburn, AL 36849
Robert H. Walker
Affiliation:
Auburn University, 201 Funchess Hall, Auburn, AL 36849
*
Corresponding author's E-mail: jsm0010@auburn.edu.
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Abstract

Centipedegrass is tolerant of both atrazine and mesotrione when applied separately to established turf. However, no information is available regarding the use of mesotrione or the synergistic mixture of atrazine plus mesotrione applied to centipedegrass during seeded establishment. Research was conducted to evaluate centipedegrass tolerance to various rates and combinations of atrazine plus mesotrione when applied 14 d after emergence (DAE). Experiment 1 evaluated centipedegrass tolerance to atrazine and mesotrione in a broad rate-range screen in a greenhouse environment. Variations were observed between greenhouse trial runs with respect to injury and biomass with less injury and decrease in biomass observed in run 2. Overall, atrazine alone and atrazine plus mesotrione were more injurious for a greater time period and decreased biomass more than mesotrione alone. In fact, although mesotrione alone initially reduced centipedegrass photosystem II efficiency, an overall increase in efficiency was observed 28 d after treatment (DAT). Based on experiment 1, atrazine at 0.28 kg ai/ha was the maximum rate that could be applied to seedling centipedegrass when tank mixed with mesotrione. Experiment 2 evaluated atrazine at 0.28 kg/ha plus mesotrione at 0.03 to 0.28 kg/ha on centipedegrass field establishment. Although all atrazine plus mesotrione treatments reduced centipedegrass ground cover 28 DAT; no treatment reduced centipedegrass ground cover 49 DAT.

Keywords

Atrazinemesotrionecentipedegrass, Eremochloa ophiuroides Munro. (Kunz) ‘Tifblair’ ERLOPSeeded establishmentturfgrass toleranceherbicide synergism
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 23 , Issue 1 , March 2009 , pp. 67 - 72
Copyright
Copyright © Weed Science Society of America 

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