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Herbicide Tolerance of Two Cold-Resistant Bermudagrass (Cynodon spp.) Cultivars Determined by Visual Assessment and Vehicle-Mounted Optical Sensing

Published online by Cambridge University Press:  20 January 2017

Gregory E. Bell ,
Dennis L. Martin ,
Roseanne M. Kuzmic ,
Marvin L. Stone  and
John B. Solie
Gregory E. Bell*
Affiliation:
Department of Horticulture and Landscape Architecture
Dennis L. Martin
Affiliation:
Department of Horticulture and Landscape Architecture
Roseanne M. Kuzmic
Affiliation:
Department of Horticulture and Landscape Architecture
Marvin L. Stone
Affiliation:
Department of Biosystems and Ag Engineering, Oklahoma State University, Stillwater, OK, 74078-6027
John B. Solie
Affiliation:
Department of Biosystems and Ag Engineering, Oklahoma State University, Stillwater, OK, 74078-6027
*
Corresponding author's E-mail: [email protected].
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Abstract

This study assessed the tolerance of ‘Midlawn’ (Cynodon dactylon × C. transvaalensis) and ‘OKS 91-11’ (C. dactylon) bermudagrass to commonly used postemergence herbicides and compared visual assessment with vehicle-mounted optical sensing (V-MOS) for evaluating herbicide phytotoxicity. Two postemergence herbicides were applied to mature stands of Midlawn and OKS 91-11 at two and four times label rates, and seven postemergence herbicides were applied at standard and two times label rates. Visual evaluation and spectral assessments were made for turf color 2, 7, 14, and 21 d after treatment (DAT). Triclopyr and triclopyr plus clopyralid at 2× and 4× label rates caused significant damage on OKS 91-11 and Midlawn bermudagrass in both July and September experiments. MSMA at 2× rate and MSMA + metribuzin at 1× and 2× rate caused up to 73% color reductions that disappeared within 21 DAT in both cultivars. During July, 2,4-D plus mecoprop plus dicamba at the 2× rate caused at least 18% injury to Midlawn bermudagrass for 21 d. Metribuzin was safe at the 1× rate but caused significant injury for up to 7 d at the 2× rate. Imazaquin and halosulfuron-methyl each caused significant damage on one rating date. Pronamide caused no change in color regardless of rate or time of application. OKS 91-11 tolerated 2× rates of 2,4-D plus mecoprop plus dicamba better than Midlawn, but cultivar responses to other herbicide treatments were similar. V-MOS was effective for measuring green color reduction on bermudagrass turf. V-MOS and visual evaluation were linearly related (P < 0.01) at a strength of r = 0.58. Statistical results obtained using visual rating and V-MOS were the same in 86% of all cases.

Keywords

2,4-Dbentazondicambahalosulfuron-methylimazaquinmecopropmetribuzinMSMAprodiaminepronamidetriclopyrcommon bermudagrass, Cynodon dactylon (L.) Pers. OKS 91-11hybrid bermudagrass, Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt-Davy, MidlawnNDVI, phytotoxicity, postemergence herbicide, spectral acquisition, turfgrass injury, turfgrass quality, variable-rate technologyCA, commercially availableDAT, days after treatmentNDVI, normalized difference vegetative indexNIR, near infraredOSU, Oklahoma State UniversityR, redV-MOS, vehicle-mounted optical sensing
Type
Research Article
Information
Weed Technology , Volume 14 , Issue 3 , September 2000 , pp. 635 - 641
Copyright
Copyright © Weed Science Society of America 

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