Full TGIF Record # 21516
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Vincelli, P. C.; Doney, J.; Powell, A. J.
Author Affiliation:Vincelli and Doney, Dept of Plant Pathology, University of Kentucky; Powell, Dept of Agronomy, University of Kentucky, Lexington, KY
Title:Evaluation of foliar fungicides for control of brown patch of perennial ryegrass, 1990
Source:Fungicide and Nematicide Tests. Vol. 46, 1991, p. 329.
Publishing Information:St. Paul, MN: American Phytopathological Society
Keywords:TIC Keywords: Lolium perenne; Brown patch; Rhizoctonia solani; Fungicides; Fungicide evaluation; Diseases; Disease control; Research
Abstract/Contents:"Foliar fungicides were evaluated in an experimental planting of perennial ryegrass at the UK Spindletop Farm in Lexington, KY. The experimental area had been used previously for evaluating varieties of perennial ryegrass; thus, the area was composed of contiguous 4 x 6 plots of different varieties. Plots measuring 6 x 9 ft were arranged in a randomized complete block design with four replicates. Plots were arranged with long axis parallel to the long axis of the variety plots, so that individual plots in this trial would overlap four plots from the original variety trial. It was anticipated that including four varieties in each plot would minimize possible variability associated with differences in varietal susceptibility. Plots were fertilized in Mar and Apr with 1.5 lb N/1000 ft2. Plots were mowed as needed to a height of 2.5 in. Fungicide treatments were applied using a CO2-powered, hand-held sprayer fitted with LF 2 80 degrees flat fan nozzles and delivering 2.4 gal/1000 ft2 at 25 psi. Fungicides applied on a 14-day schedule were sprayed on 17 and 31 May, 14 and 27 Jun, and 11 and 26 Jul; those applied on a 21-day schedule were sprayed on 17 May, 14 Jun, 8 and 27 Jun, and 20 Jul. A compost inoculant (Ringer Compost Plus, a proprietary mixture of fungal and bacterial inoculants, compost material, and fertilizer) was tested for potential biocontrol activity. The compost material was applied as a 30% mixture with sand as a topdressing (47 qt/1000 ft2) on 17 May, 14 Jun, and 16 Jul. A three-isolate mixture of Rhizoctonia solani on colonized, air-dried oats was used to inoculate plots. Inoculum (4.2 lb/1000 ft2) was applied on 2 Jul. Although irrigation was applied regularly, brown patch did not develop until several days of wet weather and disease-conducive temperatures occurred beginning 11 Jul. Disease severity was assessed on 17 and 20 Jul by visually estimating the percentage of each plot with symptoms of brown patch. On each occasion, plots were rated twice and ratings were averaged prior to analysis. Treatment means were compared using the Walker-Duncan k-ratio multiple comparison procedure (k=100, P=0.05). Aggressive development of brown patch occurred following several days of wet weather, making separation of treatments possible. Most of the fungicidal products provided control of brown patch. Disease severity in the experimental compost/sand topdressing treatment was not significantly different from the untreated control. Stimulation of the ryegrass from the nitrogen content of the compost inoculant was noted in the compost/sand topdressing treatment, and this may have increased susceptibility to the disease."
Language:English
References:0
Note:This item is an abstract, with table, only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P. C., J. Doney, and A. J. Powell. 1991. Evaluation of foliar fungicides for control of brown patch of perennial ryegrass, 1990. Fungicide Nematicide Tests. 46:p. 329.
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