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| Publication Type:
| Report |
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| Author(s): | Vincelli, P. |
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| Author Affiliation: | Department of Plant Pathology, University of Kentucky, Lexington, KY |
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| Title: | Evaluation of fungicides for curative recovery of poa annua from summer patch, 1997 |
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| Source: | Fungicide and Nematicide Tests. Vol. 53, 1998, p. 460. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Poa annua; Magnaporthe poae; Fungicides; Plant recovery; Propiconazole; Thiophanate; Myclobutanil; Cyproconazole; Azoxystrobin
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| Abstract/Contents: | "Evaluation of fungicides for curative recovery of poa annua from summer patch, 1997: The trial was mowed at 0.81 in., irrigated as needed, and fertilized with 1.3 lb N/1000 ft² as IBDU on 21 May 97. The trial was comprised of a mixture of perennial ryegrass and Poa annua, with Poa predominating in all plots at the time of treatment application. The soil was pH 5.9. Plots measured 4 ft X 4 ft and were arranged in a randomized complete block design with four replications. All plots were separated by at least 2 ft untreated border area. Plots were sprayed with a CO₂-powered hand-held sprayer fitted with spray systems 8003E flat-fan nozzles delivering 2.5 gal/1000 ft². The first application was made on 2 Jul 97; subsequent spray dates were 16 Jul and 30 Jul. Soil temperature at a 2 inch depth at 1130 hr on 1 Jul was 79°F. One-half inch of water was applied immediately after each treatment application. The percentage of plot surface with dead tissue was assessed visually by two observers on 1 Jul 97, one day before the first spray application. This assessment was used to determine whether pre-treatment levels of disease differed among treatments, which could introduce a confounding effect on turf recovery. We could not directly assess the percentage of live Poa annua showing symptoms since, on that assessment date, visual differences between the Poa and perennial ryegrass were not great enough for reliable distinction at standing height. Later assessments were taken of percent ground cover missing (to account for decomposition of grass killed previously), and of percent plot surface with Poa annua. ANOVA and the Waller-Duncan k-ratio test was used to evaluate for treatment differences. Percent data were transformed means are presented, but statistical analyses were conducted only on transformed data for making inferences. On 1 Jul, the Poa was showing severe symptoms of summer patch as well as general heat stress. This area of the fairway had a higher clay content than other areas, creating a less favorable environment for root development, thus enhancing disease pressure. Consequently, treatments were evaluated under very stringent curative conditions. The ANOVA on the pre-treatment disease severity showed clearly that there was no difference (P.0.20, analysis not shown) in percent dead grass confounded with treatment. Although variation in this parameter was great, there was no statistical adjustment techniques. Weather during the early part of Jul was rather favorable for growth of perennial rye, so some recovery of turf health occurred even in control plots. The assessments on 30 Jul allow the reader to identify treatments that improved the overall health of this mixed sward following an outbreak of summer patch (Heritage and Banner MAXX) as well as the treatment which kept more of the Poa alive than the control (Banner MAXX)." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P. 1998. Evaluation of fungicides for curative recovery of poa annua from summer patch, 1997. Fungicide Nematicide Tests. 53:p. 460. |
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