Full TGIF Record # 63279
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Publication Type:
i
Report
Author(s):Vincelli, Paul; Williams, D. W.
Author Affiliation:Departments of Plant Pathology and Agronomy, University of Kentucky, Lexington, KY
Title:Efficacy of fungicides for control of gray leaf spot of perennial ryegrass, 1998
Source:Fungicide and Nematicide Tests. Vol. 54, 1999, p. 524-525.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:2
Keywords:TIC Keywords: Lolium perenne; Gray leaf spot; Pyricularia grisea; Disease control; Fungicide evaluation; Application rates; Application frequency; Disease severity; Tank mix; Fenoxaprop-ethyl; Azoxystrobin; 2,4-D + Mecoprop; Chlorothalonil; Triadimefon; Penconazole; Trifloxystrobin; Propiconazole
Abstract/Contents:"The test was conducted on a sward on a Maury silt loam located at the University of Kentucky Turf Center. The sward was maintained at a 0.75-in. mowing height, irrigated as needed, and fertilized in Oct and Dec 97 with 1.0 lb N/1000 ft² on each application; no other fertilizer was applied. Plots measured 4 ft x 4 ft with 2-ft borders and were arranged in a randomized complete block design with three replications. Inoculum was prepared by soaking equal parts of rye, oats and barley in water overnight, autoclaving, inoculating with a local isolate of P. grisea and incubating at ca. 73 F for 2 wk; flasks were shaken to mix the inoculum after the first week of growth. The site was inoculated on 30 Jul. Fungicide sprays were applied using a CO₂-powered hand-held sprayer fitted with Spray Systems 8003E flat fan nozzles delivering 2.5 gal/1000 ft². All treatments were first applied on 28 Jul; remaining sprays were applied according to the schedule indicated below. Visual estimates of percent plot surface affected by gray leaf spot were obtained weekly (representative data are shown below). All data were analyzed using ANOVA and Duncan's Multiple Range Test, (P=0.05). Weather conditions were generally seasonable prior to and during much of the test, althought it may be significant that daily low temperatures were above-normal for much of the summer. Weather in Sep was unusually hot and dry. Disease pressure was high thoughout Aug and early Sep, providing a good evalutaion of the products tested. Most of the treatments tested provided statistically equivalent levels of disease control. It is notable, that under the high disease pressure of the test, Daconil Ultrex and Banner MAXX failed to provide acceptable disease control. Our data provided no evidence that Acclaim Extra postemergence herbicide enhanced the severity of gray leaf spot."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P., and D. W. Williams. 1999. Efficacy of fungicides for control of gray leaf spot of perennial ryegrass, 1998. Fungicide Nematicide Tests. 54:p. 524-525.
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