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Response of ‘TifEagle’ Bermudagrass (Cynodon dactylon × C. transvaalensis) to Fenarimol and Trinexapac-Ethyl

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough ,
Lambert B. McCarty  and
Haibo Liu
Patrick E. McCullough
Affiliation:
Department of Horticulture, D-136 Poole Ag. Center, Clemson University, Clemson, SC 29634-0375
Lambert B. McCarty*
Affiliation:
Department of Horticulture, D-136 Poole Ag. Center, Clemson University, Clemson, SC 29634-0375
Haibo Liu
Affiliation:
Department of Horticulture, D-136 Poole Ag. Center, Clemson University, Clemson, SC 29634-0375
*
Corresponding author's E-mail: [email protected]
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Abstract

Fall applications of fenarimol on hybrid Bermudagrass (Cynodon dactylon × C. transvaalensis) provide effective preemergence Poa annua (L.) control and suppress Ophiosphaerella spp. pathogens; however, concerns exist for turf injury and root growth restrictions. Two 60-d greenhouse studies were conducted to evaluate the effects of fenarimol at 0, 1.6, and 3.2 kg ai/ha per 30 d with and without trinexapac-ethyl (TE) at 0.017 kg ai ha/15 d on ‘TifEagle’ Bermudagrass. Turf color was enhanced by TE 14 d after initial treatment (DAIT) and was continually superior throughout the experiment. Fenarimol at 3.2 kg/ha per 30 d decreased turf color 14 DAIT, but was similar to nontreated turf on all other observation dates. Increased fenarimol rates applied twice caused approximately 10% injury at 42, 49, and 56 d after treatment; however, injury was acceptable after initial and repeat applications. TE reduced clipping yield an average 39% from six sampling dates. Initial fenarimol applications (without TE) reduced clippings by 37% 20 DAIT and repeated applications reduced clippings 40, 50, and 60 DAIT. Increased fenarimol rate linearly decreased root mass for turf treated with and without TE; however, Bermudagrass receiving TE averaged 23% enhanced root mass 60 DAIT over all fenarimol rates. Bermudagrass receiving fenarimol at 0, 1.6, and 3.2 kg/ ha per 30 d with TE averaged 27, 24, and 16% higher root mass, respectively, compared to turf receiving fenarimol without TE. Treatments had no influence on root length. Results indicate that two consecutive fenarimol applications at 1.6 and 3.2 kg/ha per 30 d may cause minor injury to TifEagle Bermudagrass and restrict root growth. Repeated TE applications, however, could decrease injury from fenarimol and enhance rooting relative to fenarimol applied exclusively.

Keywords

Annual bluegrass, Poa annua L.fenarimol, [2-(2-chlorophenyl)-2-(4-chlorophenyl)-5-pyrimidinemethanol]spring dead spot, Ophiosphaerella spptrinexapac-ethyl, [4-(cyclopropyl-[α]-hydroxymethylene)-3,5-dioxocyclohexane carboxylic acid ethylester]Fungicidesgolf coursesplant growth regulatorsPGRsroot growthturfgrass
Type
Research
Information
Weed Technology , Volume 20 , Issue 1 , March 2006 , pp. 1 - 5
Copyright
Copyright © Weed Science Society of America 

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