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| Publication Type:
| Report |
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| Author(s): | Vincelli, Paul;
Doney, Jack C. Jr.;
Powell, A. J. |
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| Author Affiliation: | Vincelli & Doney, Dept. of Plant Pathology; Dept. of Agronomy, University of Kentucky, Lexington, KY 40546-0091 |
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| Title: | Evaluation of fungicides for control of anthracnose/brown patch complex, 1994 |
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| Section: | Turf Grass Reports
Other records with the "Turf Grass Reports" Section
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| Source: | Fungicide and Nematicide Tests. Vol. 50, 1995, p. 355. |
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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: Agrostis stolonifera; Brown patch; HAS decline; Anthracnose foliar blight; Fungicide evaluation; Disease control; Agrotis ipsilon; Phytotoxicity; Rhizoctonia solani; Colletotrichum graminicola
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| Cultivar Names: | Penncross |
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| Abstract/Contents: | "The test was conducted on a sward of creeping bentgrass (cv. Penncross) on a Maury silt loam at the University of Kentucky Spindletop Farm. The turf was mowed at 0.25 in., irrigated as needed, and fertilized as follows: 1 lb N/1000 ft₂ on 8 Oct and 17 Dec 93; 0.5 lb N/1000 ft₂ on 16 May 94; and 1 lb N/1000 ft₂ on 21 Aug 94. Plots measured 4 ft x 4 ft with 2-ft boarders and were arranged in a randomized complete block design with three replications. Sprays were applied using a CO²-powered, hand-held sprayer fitted with Spray Systems 8003E flat fan nozzles which delivered 2.5 gal/1000 ft₂. Control plots were treated with water. All treatments were applied during early am hours on 27 May; subsequent applications were made following the schedules indicated on the table below. Actual spray dates were 27 May, 8 & 22 Jun, 6 & 20 Jul, and 4 Aug. Anthracnose developed from natural inoculum; the center of each plot was inoculated by uniformly applying 0.2 oz dried, ground, Rhizoctonia solani-infested corn on 27 Jun. Diseases were assessed by estimating percent area affected. When active "smoke rings" of brown patch were evident, that disease was assessed individually. In the absense of "smoke rings", reliable discrimination between the two diseases is difficult, so a combined assessment of anthracnose/brown patch (An/BP) was made. Appropriate transformations were used to meet ANOVA assumptions. To document pathogen activity, 25 plugs were collected at random from untreated border areas on three dates, incubated in a moist chamber for 24 hr, and two tillers/plug were examined microscopically. Plots were treated to control black cutworms with Sevinmol F at 6 fl oz/1000 ft₂ on 21 Jul. Very warm weather in mid- to late-June was favorable for development of early-season activity of R. solani; active patches were observed on 21 Jun in several Chitosan plots and control plots but not in other treatments. Active smoke rings were not observed subsequent to that assessment, and cooler-than-normal weather after the first week in July limited further brown patch activity. Anthracnose pressure became increasingly severe as the season progressed. Based on both regular visual and microscopic observations, it was concluded that anthracnose was the primary factor causing symptoms of the An/BP complex after mid-July. The incidence of C. graminicola on tillers on 22 Jun, 19 Jul, and 18 Aug was 36%, 66% and 90%, respectively; on those same dates, R. solani was detected on 30%, 72%, and 66%, respectively. Chitosan plots turned dark green for several weeks after application, and exhibited and undesirable chlorosis on 27 Jun. Excessive nitrogen application was suspected to be the cause of the symtoms observed, as a lab analysis indicated a total N content of Chitosan to be 9.6%. Plots treated with Sentinel occasionally exhibited a slightly coarser texture. No other phytotoxicity was noted in the test." |
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| Language: | English |
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| References: | 0 |
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| Note: | Report #345
Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P., J. C. Jr. Doney, and A. J. Powell. 1995. Evaluation of fungicides for control of anthracnose/brown patch complex, 1994. Fungicide Nematicide Tests. 50:p. 355. |
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