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Dollar Spot Severity as Influenced by Trinexapac-ethyl, Creeping Bentgrass Cultivar, and Nitrogen Fertility

Dep. of Plant Sciences, Montana State Univ., Bozeman, MT 59717-3140
Dep. of Horticulture and Crop Science, The Ohio State Univ., Columbus, OH 43210-1086

^* Corresponding author (danneberger.l{at}osu.edu).

Dollar spot (Sclerotinia homoeocarpa F.T. Bennelt) is a widely distributed and destructive pathogen of turfgrass in the United States. A 2-yr field study was conducted at Columbus, OH, to determine the influence of a plant growth regulator, creeping bentgrass (Agrostis stolonifera L.) cultivars, and N fertility on dollar spot severity. ‘Crenshaw’ creeping bentgrass was seeded alone or in a 50:50 blend by weight with ‘Penncross’ creeping bentgrass. Plots were fertilized at 0, 24.4, or 48.8 kg N ha^–1 per application. One-half of each plot received trinexapac-ethyl (TE) [4-(cyclopropyl--hydroxymethylene)-3,5-dioxo-cyclohexanecarboxylic acid methyl ester] at 0.8 L ha^–1. The TE and fertilizer treatments were initiated in May 1995 and 1996 with four subsequent applications made at 30-d intervals. Initially, the cultivar blend reduced the rate of dollar spot development compared with Crenshaw alone; however, neither the blend nor Crenshaw provided commercially acceptable dollar spot suppression throughout the study. Both TE and N fertilization significantly (P 0.05) reduced dollar spot severity over the 2-yr period. Trinexapacethyl applied alone effectively suppressed dollar spot activity, but efficacy increased with increasing N rates. Dollar spot symptoms decreased and thatch thickness increased at elevated N levels. During this 2-yr study, interactions between TE and N fertility resulted in a significant (P 0.05) reduction in dollar spot severity. Thus, on golf course fairways where dollar spot may be severe, incorporation of these two treatments into a turfgrass management program will enhance dollar spot suppression and reduce fungicide inputs.

Received for publication July 15, 1997.

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