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Anthracnose Severity on Annual Bluegrass Influenced by Nitrogen Fertilization, Growth Regulators, and Verticutting

Dep. of Plant Biology and Pathology, 59 Dudley Rd., Rutgers Univ., New Brunswick, NJ 08901-8520. New Jersey Agricultural Experiment Station Publication No. D- 12294-7-07

^* Corresponding author (murphy{at}aesop.rutgers.edu).

Frequency and severity of anthracnose epiphytotics, caused by Colletotrichum cereale Manns Manns sensu lato Crouch, Clarke, and Hillman, on annual bluegrass (ABG) [Poa annua L. f. reptans (Hauskins) T. Koyama] putting greens have increased over the past decade. This 3-yr field study evaluated the impact of N fertilization (4.9 kg ha^–1 every 7 or 28 d), mefluidide (ME; 0 and 0.106 kg a.i. ha^–1 yr^–1) {N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl]amino]phenyl]acetamide}, trinexapac-ethyl (TE; 0 and 0.050 kg a.i. ha^–1 every 14 d) [4-(cyclopropyl--hydroxy-methylene)-3,5-dioxocyclohexanecarboxylic acid ethylester], verticutting (VC; 0- and 3-mm depth every 14 d), and interactions of these factors on anthracnose of ABG mowed at 3.2 mm. Nitrogen fertilization frequency had the greatest influence on disease throughout the study; N applied at 4.9 kg ha^–1 every 7 d reduced damage 5 to 24% compared to a 28-d interval. The plant growth regulators, ME and TE, frequently interacted during the last 2 yr of the study; sequential application of ME and TE reduced disease 6 to 14% compared to plots that only received one of these plant growth regulators. At advanced stages of disease, the combination of 7-d N fertilization and ME and TE application had the greatest disease reduction. Verticutting had little effect on anthracnose severity.

Abbreviations: ABG, annual bluegrass • ME, mefluidide • N, nitrogen • PGR, plant growth regulator • PIGE, post-inhibition growth enhancement • TE, trinexapac-ethyl • VC, verticutting • WAT, weeks after treatment

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Received for publication June 17, 2007.

This article has been cited by other articles:

				J. C. Inguagiato, J. A. Murphy, and B. B. Clarke Anthracnose Disease and Annual Bluegrass Putting Green Performance Affected by Mowing Practices and Lightweight Rolling Crop Sci., June 26, 2009; 49(4): 1454 - 1462. [Abstract] [Full Text] [PDF]