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| Publication Type:
| Report |
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| Author(s): | Brede, A. D.;
Williams, R. R.;
Chastain, T. G. |
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| Author Affiliation: | Oregon State University |
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| Title: | Control of ergot in Kentucky bluegrass seed production, 1989 |
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| Source: | Fungicide and Nematicide Tests. Vol. 45, 1990, p. 288. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Ergot; Poa pratensis; Flusilazol; Prochloraz; Triforine; Propiconazole
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| Abstract/Contents: | "Fungicides were evaluated at the McLain farm seed production field of Adelphi 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 and 3 gallons per 1000 ft2 carrier rate. Treatments were applied at (1) pre-anthesis (5 June 89), (2) full anthesis (9 June 89), and (3) post-anthesis (28 June 89). Treatments were evaluated on 10 July 89 by grasping the inflorescences and feeling for sticky "honeydew." Ergot sclerotia were counted per 100 randomly selected mature seedheads per plot. Weight of seed per 100 seedheads and percent germination were determined on the same heads. Germination was determined following seed cleaning, employing standard AOSA methods, with 100 seeds in one dish per plot. Ergot severity in the untreated plots was exceedingly light, allowing for excellent separation of treatments. Nustar provided complete control of ergot. Nustar applied at the 15 and 30 fl oz rates shortened culm length through what appeared to be a growth regulating effect; this effect may be viewed as desirable by seed producers, since it results in lesser lodging. The 30 fl oz rate of Nustar reduced germination rate and seed yield; germination of seedlings following treatment at this rate was abnormal and distorted. Prochloraz, Triforine, Tilt, and Alliette provided significant ergot control, compared to the untreated control, however the level of control provided by the latter two products was numerically small. Penaturf (a surfactant) provided a significant degree of ergot control, when applied at anthesis. It was hypothesized that the surfactant broke down the sticky honeydew of the ergot, which is used by the fungus for secondary infection." |
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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):
Brede, A. D., R. R. Williams, and T. G. Chastain. 1990. Control of ergot in Kentucky bluegrass seed production, 1989. Fungicide Nematicide Tests. 45:p. 288. |
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