Full TGIF Record # 13425
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Author(s):Powell, A. J. Jr.; Tapp, Linda; Hartman, J. R.; Clinton, W.
Title:Effects of cultural practices on control of summer patch and necrotic ringspot of Kentucky bluegrass-1988
Source:Kentucky Turfgrass Research. 1988, p. 45-46.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Series:Progress Report 319
Keywords:TIC Keywords: Poa pratensis; Necrotic ring spot; Summer patch; Cultural methods; Fenarimol; Potash; Urea; IBDU; Irrigation practices; Disease control; Fungicides; Fertilization; Soil amendments; Magnaporthe poae; Ophiosphaerella korrae; Application rates; Application timing
Abstract/Contents:1988 study to determine if altering conventional fertilization and irrigation procedures would reduce summer patch and necrotic ringspot levels in Kentucky bluegrass. Cultural practices were evaluated for summer patch and necrotic ring spot prevention on an "Adelphi" Kentucky Bluegrass fairway located at Griffin Gate golf course near Lexington. The turfgrass was maintained at a 0.75 in. mowing height (gradually lowered to 0.5 in. during August), received 2.0 lb of nitrogen annually, had previously been irrigated as needed, was cored for aerification on April 12, and otherwise received conventional fairway maintenance. Each treatment was replicated four times in a randomized complete block design with 12 ft x 20 ft plots. The entire experiment was repeated on two different parts of the fairway, on receiving daily mid-day irrigation of 0.1 in. of water (May 31-June 16 only) in addition to the as needed irrigation applied to all fairways. Comparisons were made between the effects of Rubigan fungicide treatment, fertilizer (IBDU, Urea, Ringer, and potassium) applications, and combinations of treatments. The rates used and timing of treatments are presented in the table. Plots were evaluated by estimating the percent turfgrass stand loss on September 8. A table provides treatments, rate and time of application, and results of both irrigated blocks. Patch disease symptoms first appeared in July, as in previous years. Summer patch was likely the predominant disease. Due to hot, dry weather and water usage restrictions, the plots became dormant for much of July, but gradually greened up in late summer as light rains fell and irrigation water became more available. None of trhe treatments satisfactorily controlled the disease. Despite using several nitrogen treatments. Fairways may already have had adequate N early in the season, and extreme drought would have masked any effect of N the remainder of the season. Although the daily irrigated plots consistently showed less disease, their establishment in a possibly more disease-prone area precludes making conclusions as to this effect.
Geographic Terms:Kentucky
See Also:Other items relating to: SUMPAT
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Powell, A. J. Jr., L. Tapp, J. R. Hartman, and W. Clinton. 1988. Effects of cultural practices on control of summer patch and necrotic ringspot of Kentucky bluegrass-1988. KY. Turfgrass Res. p. 45-46.
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