Full TGIF Record # 24512
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Publication Type:
i
Report
Author(s):Dernoeden, P. H.; Fidanza, M. A.
Author Affiliation:Dept. of Agronomy, Univ. of Maryland, College Park, MD
Title:Curative brown patch control with MON 24017, 1991
Source:Fungicide and Nematicide Tests. Vol. 47, 1992, p. 314.
Publishing Information:St. Paul, MN: American Phytopathological Society
Keywords:TIC Keywords: Lolium perenne; Brown patch; Rhizoctonia solani; Disease control
Abstract/Contents:"Brown patch was active and damaging to the perennial ryegrass stand in late May, and on 3 Jun 6.0 fl. oz of Daconil 2787 was applied to the entire test site. The study, however, was initiated on 12 Jun, at which time R. solani was active and 10 to 15% of the ryegrass site exhibited some blighting of foliar tissues. Treatments were applied on wither a 14, 28, or 42 day interval with a CO2 pressurized (36 psi) sprayer in 2.5 gal water per 1000 ft2 on the dates noted in the data table. Soil was a Chillum silt loam with a pH of 5.9 and 1.6% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted was determined visually on a 0 to 100% scale. Ratings that exceed 5% plot area blighted would be considered unacceptable control on a golf course fairway. Environmental conditions were conductive [conducive] to severe brown patch pressure from late May to mid-Aug. The 25 Jun recording data reflected primarily new foliar blighting; whereas, all ratings taken thereafter represent a composite damage rating despite some injury occurring prior to the initial 12 Jun application of treatments. While all blight ratings among fungicide-treated plots were between 0 and 3% on 25 Jun, damage assessment increased dramatically with the composite 1 Jul rating. Disease pressure was intense through most of Jul. On 1 Jul only Chipco 26019-treated plots possessed acceptable disease control ratings. On 1 Jul, (except MON 27017 at 2.0 oz and ProStar 3.0 oz on the 28 day interval) and 8 Jul, all treatments had significantly reduced blighting. Blight ratings remained stable from 1 Jul to 5 Aug. There were no significant rate by spray interval effects among Mon 24017 treatments or between ProStar and Chipco 26019 treatments. While there was a trend for less blighting as MON 24017 rates were increased, it appeared tha MON 24017 and ProStar-treated turf never sufficiently recovered from the foliar R. solani infections that occurred prior to fungicide application. This hypothesis was partially confirmed on 19 Aug 1991 when plugs taken from MON 27017 (0.5 oz on 14-day schedule) and ProStar (3.0 oz)-treated, and untreated plots were incubated overnight in a humidity chamber. In the morning, leaves from untreated plugs were matted with R. solani mycelium; whereas, MON 27017 and ProStar-treated plugs had no visible mycelium. Leaf spot (Bipolaris sp.) lesions were evident on leaves. However, a thatch-wash sample revealed only a modicum of Bipolaris sp. conidia and therefore leaf spot had not caused any significant damage. Chipco 26019 provided excellent curative and subsequent preventative protection against R. solani regardless of being applied on either a 14 or 28 day interval."
Language:English
References:0
Note:Table
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., and M. A. Fidanza. 1992. Curative brown patch control with MON 24017, 1991. Fungicide Nematicide Tests. 47:p. 314.
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