Full TGIF Record # 19382
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Author(s):Hartman, J. R.; Powell, A. J. Jr.; Clinton, W.
Title:Effects of chemical treatments on control of summer patch and necrotic ring spot of Kentucky bluegrass, 1988
Source:Kentucky Turfgrass Research. 1988, p. 47-48.
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; Fungicide evaluation; Spring; Magnaporthe poae; Ophiosphaerella korrae; Application timing; Chemical control; Application rates
Abstract/Contents:1988 study to determine if spring-applied fungicides can effectively control necrotic ring spot and summer patch in Adelphi Kentucky bluegrass. Fungicide treatments were evaluated for summer patch and necrotic ring spot prevention on a 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 Aug), received 2.0 lb of nitrogen annually, was irrigated as needed and otherwise received conventional fairway maintenance. Each treatment was replicated four times in a randomized complete block design with 12ft x 15ft plots. Treatments were applied using a hand-pumped Solo backpack sprayer operation at 25 psi. Most treatments were applied 30 Mar and 29 Apr. High rates of Banner and Rubigan were applied 30 Mar only, and another Banner treatment was applied 31 May, 30 Jun, and 1 Aug. Overhead irrigation was used to apply 0.2 in. water to all plots within 12 hr after the 30 Mar fungicide treatments. Plots were evaluated by counting the number of patch disease infection centers on 8 Jul and 30 Aug. A table provides treatment, rate and timing of application and number of patches/plot on 7/8 and 8/30. Patch disease symptoms (both necrotic ring spot and summer patch had been found in this area before) first appeared in July, as in previous years. The two diseases were evaluated as one; however, based on previous experience, summer patch was most likely the predominant disease. Patch disease development, erratic at first, was severe by the end of Aug. The growing season was hot and dry. None of the treatments satisfactorily controlled the disease; however, summer applications of Banner provided significant control when compared to untreated plots.
Geographic Terms:Kentucky
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hartman, J. R., A. J. Jr. Powell, and W. Clinton. 1988. Effects of chemical treatments on control of summer patch and necrotic ring spot of Kentucky bluegrass, 1988. KY. Turfgrass Res. p. 47-48.
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