Full TGIF Record # 53151
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Publication Type:
i
Report
Author(s):Vincelli, P.; Williams, D.
Author Affiliation:Departments of Plant Pathology & Agronomy, University of Kentucky, Lexington, KY 40546-0091
Title:Impact of mowing height and nitrogen fertility on brown patch of tall fescue, 1997
Section:Turfgrasses
Other records with the "Turfgrasses" Section
Source:Biological and Cultural Tests for Control of Plant. Vol. 13, 1998, p. 143.
Publishing Information:St. Paul, MN: The American Phytopathological Society
# of Pages:1
Abstract/Contents:"The test was established in a sward of 'Rebel Jr.' tall fescue at the UK Turf Research Center in Lexington. The sward was established in 1992; treatments tested here were imposed for the first time in 1996. A factorial treatment structure in a randomized complete block design (four replicates) was used with three mowing heights crossed with three nitrogen (N) fertility regimes. Plots measured 6 X 16 ft. Mowing treatments evaluated were: 0.75 - 1.0 in. mowed X/wk; 2.5 in. mowed 1-2X/wk; and 4 in. mowed 1X/wk. Fertility regimes evaluated were (per 1000 ft²): 0 lb N; 2 lb N; (1 lb N on about 1 Apr and on 1 Jun); and 4 lb N/1000 ft² (1 lb on about 1 Apr, 1 May, 1 Jun, and 1 Jul). All plots received maintenance applications of 1.5 lb N/1000 ft² in October and December annually. Urea (46-0-0) was used for all fertilizer applications. Irrigation was applied as needed for maintenance of the turf mowed at 0.75 - 1.0 in. Visual assessments were made of percentage of plot surface with foliar blighting due to brown patch, percentage of plot surface with dead grass, and percent of plot with dead Poa (which could be visually differentiated from dead tall fescue based on color). Percent dead Poa was subtracted from percent dead grass to derive an estimate of percent dead tall fescue. Percentage data were arcsine-transformed and analyzed by ANOVA. Dead tall fescue tillers were randomly sampled and examined under the compound microscope for signs of Rhizoctonia. Weather during Jun was unusually cool and wet, with record lows being set in mid-month in many areas. Much of July was rain-free, and an extended heat wave occurred during the latter part of the month. During August, generally cool to moderate temperatures with periodic rainfall prevailed. Foliar blighting from brown patch increased with increasing mowing height in this test, consistent with previous results (B&C Tests 10:42, 1995 and B&C Tests 12:129, 1997). In contrast to the trends with foliar blight, tiller loss attributable to crown and root infections by R. solani was more severe with a low mowing height. We attributed the tiller loss observed to R. solani based on the following: occurrence in patches typical of brown patch; presence of hyphae typical of R. solani on roots and crowns of dead and moribund plants; and in a separate, adjacent test on tall fescue cv. 'Rebel Jr.', control of these symptoms in plots where fungicides effective against R. solani were applied. We speculate that the extended wet weather in June may have allowed extensive crown infections to occur, the symptoms of which became apparent during hot weather in July. N fertility had little effect on either foliar blighting or plant death; whereas in 1994, increasing summertime N fertility was associated with increasing brown patch throughout the epidemic. Relative to this result, it is worth noting that striking visual differences among plots due to differeing N fertility levels were not apparent during two years of tests conducted on this sward, wheras they were apparent in the sward used in 1994. This suggests that inherent N fertility of the present sward is higher than that of the sward used in 1994. As in previous years, no mow X nitrogen interaction was detected (P>0.20), suggesting that these factors may act separately to influence brown patch development. However, we postulate that a significant interaction is more likely in swards where the N effect is significant. For mowing height, significant (P<0.05) standardized regression coefficients for foliar blighting were ovserved on 27 Jun, and 21 Jul and were 0.05531, and 0.15630, respectively; that for % dead tall fescue was non-significant. All standardized regression coefficients for N effects were non-significant."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P., and D. Williams. 1998. Impact of mowing height and nitrogen fertility on brown patch of tall fescue, 1997. Biol. Cult. Tests Control Plant Dis. 13:p. 143.
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