Full TGIF Record # 19204
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Author(s):Kennedy, B. S.; Nesmith, W. C.; Hartman, J. R.
Title:Timing of Banner applications for controlling summer patch/necrotic ring spot on Kentucky bluegrass, 1989
Source:Kentucky Turfgrass Research. 1990, p. 25-26.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Series:Progress Report 328
Keywords:TIC Keywords: Poa pratensis; Summer patch; Necrotic ring spot; Patch diseases; Magnaporthe poae; Ophiosphaerella korrae; Fungicides; Application timing; Propiconazole; Precipitation; Fungi; Life cycle
Abstract/Contents:Preliminary report to determine proper time to control patch disease caused by the fungi Magnaporthe poae and Leptosphaeria korrae. Single applications of Banner 1.1E (8oz/100ft2), fungicide made monthly from March to August 1989 on a Kentucky bluegrass Adelphi fairway near Lexington, KY. The turfgrass was maintained at 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 10 ft x 15 ft plots. Treatments were applied mid-month (within 10 days of the 15th) using a carbon dioxide sprayer with a 5 ft four nozzle boom delivering 3 gal/1000 ft2 and operation at 25 psi. Treatments were watered in with a hand held sprinkling can equivalent to 0.03 in. of irrigation. Researchers evaluated plots on Sept 13 by counting the number of infection centers. Summer patch and necrotic ring spot were evaluated as one and were detected in this fairway in previous years. Tables provide rainfall data, infection center counts, and ANOVA results. Preliminary findings indicated that summer patch is this site's dominant disease. Patch disease symptoms first appeared near the end of Aug and became most severe when the turf was lowered to 0.5 in. When regular growing height was resumed in Oct, the turf recovered. The long-term damage from these diseases was relatively low when compared to previous years, even though numbers of infection centers were high. All treatments were significantly different from the control plot, except the May application. Large amounts of rainfall on the day of application or one day post application may have affected the Jun, Jul and Aug treatments. The study will be continued to include 12 treatments.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kennedy, B. S., W. C. Nesmith, and J. R. Hartman. 1990. Timing of Banner applications for controlling summer patch/necrotic ring spot on Kentucky bluegrass, 1989. KY. Turfgrass Res. p. 25-26.
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