Full TGIF Record # 24500
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Publication Type:
i
Report
Author(s):Schultz, T. R.; Johnston, W. J.; Golob, C. T.
Author Affiliation:Dept. of Crop and Soil Sciences, Washington State University, Pullman, WA
Title:Control of ergot in Kentucky bluegrass seed production using fungicides, 1991
Source:Fungicide and Nematicide Tests. Vol. 47, 1992, p. 302.
Publishing Information:St. Paul, MN: American Phytopathological Society
Keywords:TIC Keywords: Ergot; Control; Poa pratensis; Seed production; Fungicides
Abstract/Contents:"Fungicide trials were conducted in a commercial Kentucky bluegrass seed production field near Post Falls, ID. Individual treatment plots were 10 x 20 feet with four replications in a randomized complete-block, split-plot design. Two fungicides were applied at two rates and one fungicide was applied at three rates of active ingredient per acre. In addition, all fungicides were applied at their lowest rate in combination with a wetting agent. Treatments were applied with a CO2 pressurized boom sprayer at 40 psi using a 28 gal/acre carrier rate on 5 June (pre-anthesis) and 16 June (30% anthesis). Plots were rated for disease severity on 8 July by visually observing the amount of sclerotia and seedhead exudate (honeydew) on the panicles. On 12 July, 20 panicles were harvested by hand from each plot and the mean weight of clean seed, 1000 seed weight, and sclerotia per panicle were determined. Disease was observed in all plots and was severe in untreated plots. All fungicide treatments significantly reduced disease when compared to untreated plots. Disease was reduced to near zero in plots treated with Punch at 30 or 45 oz. per acre or, treated with a fungicide-wetting agent combination of Punch and Penaturf or Folicur and Penaturf when applied at pre-anthesis. Fungicides were more effective at controlling disease when applied at pre-anthesis then at mid-anthesis. Disease control was significantly greater when fungicides were used in combination with a wetting agent than when used alone at the same rate. Seed yield per panicle was reduced when using the most efficacious fungicides or fugicide-wetting agent combinations when compared to the untreated control. Date of application was not significant for seed or sclerotia weight/panicle, or 1,000 seed weight. Weight per 1,000 seed was not significantly affected by any of the treatments."
Language:English
References:0
Note:Table
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Schultz, T. R., W. J. Johnston, and C. T. Golob. 1992. Control of ergot in Kentucky bluegrass seed production using fungicides, 1991. Fungicide Nematicide Tests. 47:p. 302.
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