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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Brede, A. D.;
Williams, R. R. |
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| Author Affiliation: | Jacklin Seed Company, Post Falls, Idaho |
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| Title: | Control of Ergot in Kentucky Bluegrass seed production, 1990 |
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| Source: | Fungicide and Nematicide Tests. Vol. 46, 1991, p. 310. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Poa pratensis; Ergot; Claviceps purpurea; Fungicides; Diseases; Disease control; Wetting agents
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| Geographic Terms: | Idaho |
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| Abstract/Contents: | "Fungicides were evaluated at the Satchwell farm seed production field of Plush Kentucky bluegrass, located north of Post Falls, Idaho. Individual treatment plots were 10 x 20 ft with a 10 x 20 ft paired, untreated check. Treatments were applied using a CO2-driven four nozzle boom sprayer, operating at 30 psi. Treatments were applied on 14 June and were evaluated on 5 July by grasping the inflorescences and feeling for sticky "honeydew." Ergot sclerotia were counted per 100 randomly selected mature seedheads per plot, harvested 11 July. Weight of seed and ergot sclerotia per 100 seedheads and percent germination after 7 and 14 days were taken on the same heads. Germination was determined following seed cleaning, employing standard AOSA methods, with 100 seeds in one dish per plot. Plush Kentucky bluegrass is commonly noted for its ergot susceptibility. Disease severity in the field was exceedingly high, allowing for excellent separation of treatments. None of the treatments gave 100% disease control, probably owing to the severity of the epidemic. However, several treatments provided ergot reductions satisfactory for commercial seed production. The three fungicides, Nustar, Prochloraz, and San-619, provided significant reduction in ergot sclerotia and honeydew severity over that of the control. It appeared that the optimal carrier rate for Prochloraz was 40 gal/A. The three surfactants, Aquagro, Perk, and R-11, provided better reduction of honeydew than the fungicides. The 40 gal/A carrier rate was no better than the 130 gal//A rate for Aquagro. Reduction of sclerotia by the surfactants was generally equivalent to that of the fungicides. Therefore, until the foregoing experimental fungicides are commercially available, surfactant can be an adequate substitute for ergot control in seed production. Effect of treatments on seed germination was largely nonsignificant. Phytotoxicity was not severe, but statistical differences were found. The surfactants were more phytotoxic than the fungicides and untreated control." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: Wetting Agents |
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| Note: | This item is an abstract, with table, only!
Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Brede, A. D., and R. R. Williams. 1991. Control of Ergot in Kentucky Bluegrass seed production, 1990. Fungicide Nematicide Tests. 46:p. 310. |
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