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| Publication Type:
| Report |
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| Author(s): | Vincelli, P. C.;
Powell, A. J.;
Doney, Jack Jr. |
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| Author Affiliation: | Dept. of Plant Pathology, Dept. of Agronomy--Univ. of Kentucky, Lexington, KY |
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| Title: | Control of spring dead spot of bermudagrass, 1990-91 |
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| Source: | Fungicide and Nematicide Tests. Vol. 47, 1992, p. 294. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Cynodon; Disease control; Spring dead spot; Ophiosphaerella korrae
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| Abstract/Contents: | "Plots were established in a bermudagrass (cv. Vamont) polo field at the Kentucky Horse Park in Lexington. The field has a history of severe outbreaks of spring dead spot. Plots measuring 12 x 22 ft. were arranged in a randomized complete block design with five replicates. Treatments were applied using a hand-held, CO2-powered sprayer fitted with LF-2-80 flat fan nozzles and delivering 2.0 gal/1000 ft2. All plots, including controls, were irrigated (approx. 38 gal/1000 ft2) immediately after treatment except when rain was falling while treatments were applied. Treatments listed in Table 1 were applied once, twice, or four times. Soil temperatures (3 in. depth) at treatment application were: 66 F on 2 Oct 90: 57 F on 12 Oct during a rain; 52 F on 25 Oct during a rain; and 58 F on 1 Nov. Following spring greenup, plots were rated on 28 May 91 for percentage of plot surface exhibiting spring dead spot. Ratings were assigned for the entire trial twice b one observer; ratings for each plot were averaged to derive a single estimate of percentage spring dead spot. Data were analyzed by analysis of variance and Fisher's least significant difference (P=0.05). All three fungicides tested provided a small but significant (P=0.05) reduction in spring dead spot when multiple applications at lower rates were made. Single applications at high rates of the fungicides tested failed to significantly reduce spring dead spot severity as compared to the untreated control. No treatment tested in this study provided complete control of spring dead spot. However, the partial control observed in these studies may be useful when combined with cultural practices that also provide an increment of disease control. Isolations were made from plugs of diseased turf by Dr. Bill Shane (The Ohio State University) and Dr. Ned Tisserat (Kansas State University). Fungi similar to Leptosphaeria korrae were isolated from diseased turf by both researchers, and isolates reacted positively with a cloned DNA probe specific to L. korrae. Visibly greater dormant leaf tissue was observed on 29 Jan 91 in all plots treated twice with Chipco 26019 or Lynx 1.2EC. Although the significance of this observation is uncertain, this may indicate greater late-season vigor in these plots." |
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| Language: | English |
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| References: | 0 |
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| Note: | Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P. C., A. J. Powell, and J. Jr. Doney. 1992. Control of spring dead spot of bermudagrass, 1990-91. Fungicide Nematicide Tests. 47:p. 294. |
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