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| Publication Type:
| Report |
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| Author(s): | Barstow, Ben |
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| Author Affiliation: | University of Idaho |
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| Title: | Fungicidal control of rust on bluegrass seed crops, 1989 |
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| Source: | Fungicide and Nematicide Tests. Vol. 45, 1990, p. 273. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Poa pratensis; Rusts; Chlorothalonil; Propiconazole; Triadimefon
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| Abstract/Contents: | "Fungicide plots were established in a commercial Lewis County, Idaha field which showed potential for Puccinia spp. infestation. Material were applied to 6 ft by 20 ft plots in 25 gal of water per acre using a CO2 backpack sprayer equipped with hollow cone nozzles. Plots received three applications of either Bravo alone, Bravo + Tilt, Tilt alone, Bayleton, SDS-66792, BAY HWG-1608, or a water control. Treatments were replicated six times in a randomized leaf ligule just emerged), on 8 May. The second application was made at Feekes stage 10 on 16 May, and the third on 22 May at Feekes stage 10.2-10.3 (1/4 to 1/2 inflorescence emerged). Rust pustules were first observed 8 May and continued to develop until crop maturity. Visual ratings of rust infestation were made 6 July by examining eight randomly chosen culms in each plot. Condition of the flag leaf and penultimate leaf were recorded on a 0 to 8 scale. A 10.8 square foot sample was cut from a representative area of each plot on 10 July. Samples were bagged, air dried for 10 days, and thrashed. Uncleaned seed was weighed. All treatments produced significantly lower flag leaf disease scores compared to the control. Plots treated with Bravo, alone or in combination, showed significantly less rust on flag leaves than Bayleton or Tilt plots. Neither Bayleton nor Tilt plots averaged penultimate leaf scores significantly less than the control. Three treatments, Bravo + Tilt, SDS 66792, and BAY HWG-1608 plots, averaged higher penultimate leaf scores than Bayleton plots. In general, the fungicides were effective in reducing the incidence of rust pustules and prolonging the health of the leaves examined. The effect was more pronounced on the flag leaf. In spite of the effects on visual appearances, there were no significant yield effects in this test (F=0.5, df=6,30; P>F=0.81). Yields from plots receiving the same treatment varied as much as 700 lbs per acre between replications." |
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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):
Barstow, B. 1990. Fungicidal control of rust on bluegrass seed crops, 1989. Fungicide Nematicide Tests. 45:p. 273. |
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MSU catalog number: SB 951.3 .F82 |
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