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Biochemical Effects of Imazapic on Bermudagrass Growth Regulation, Broomsedge (Andropogon virginicus) Control, and MSMA Antagonism

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough ,
Jialin Yu ,
Donn G. Shilling ,
Mark A. Czarnota  and
Christopher R. Johnston
Patrick E. McCullough*
Affiliation:
Crop and Soil Science Department, University of Georgia, Griffin, GA 30223
Jialin Yu
Affiliation:
Crop and Soil Science Department, University of Georgia, Griffin, GA 30223
Donn G. Shilling
Affiliation:
Crop and Soil Science Department, University of Georgia, Griffin, GA 30223
Mark A. Czarnota
Affiliation:
Department of Horticulture, University of Georgia, Griffin, GA 30223
Christopher R. Johnston
Affiliation:
Crop and Soil Science Department, University of Georgia, Griffin, GA 30223
*
Corresponding author's E-mail: pmccull@uga.edu
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Abstract

Broomsedge populations have increased substantially over the last decade on roadsides in Georgia. The invasiveness of this species might have resulted from imazapic use for bermudagrass growth regulation and the limited use of MSMA on roadsides. The objectives of this research were to evaluate (1) differential growth inhibition of bermudagrass and broomsedge to imazapic, (2) susceptibility of isolated acetolactate synthase (ALS) enzymes of bermudagrass and broomsedge to imazapic, (3) broomsedge control with tank mixtures of imazapic with MSMA, and (4) the influence of imazapic on absorption and translocation of 14C-MSMA. In greenhouse experiments, imazapic reduced bermudagrass shoot biomass ~ 2 times more from the nontreated than broomsedge. Isolated ALS enzymes of bermudagrass were ~ 100 times more susceptible to inhibition by imazapic than broomsedge. In field experiments, imazapic provided no control of broomsedge, but MSMA alone controlled broomsedge 81% at 12 mo after initial treatments (MAIT). Broomsedge control was reduced to 45% when MSMA was tank mixed with imazapic at 12 MAIT. In laboratory experiments, imazapic tank mixtures did not reduce broomsedge absorption or translocation of 14C-MSMA. Overall, bermudagrass is more susceptible to imazapic due to greater target-site inhibition than broomsedge. Results emphasize the importance of MSMA use for broomsedge control, but agronomists should avoid tank mixtures with imazapic to reduce potential antagonism.

Keywords

Bermudagrass, Cynodon dactylon (L.) Pers × C. transvaalensis Burtt-Davy ‘Princess-77’broomsedge, Andropogon virginicus L.Acetolactate synthasegrowth regulationherbicideorganic arsenicalroadsideturfgrass
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 63 , Issue 3 , September 2015 , pp. 596 - 603
Copyright
Copyright © Weed Science Society of America 

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