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| Web URL(s): | https://turf.rutgers.edu/research/abstracts/symposium2002.pdf#page=53
Last checked: 02/06/2017
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Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Towers, Gabriel W.;
Meyer, William;
Heckman, Joseph;
Clarke, Bruce B. |
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| Author Affiliation: | Department of Plant Biology and Pathology, Rutgers University |
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| Title: | Influence of nitrogen and liming on the incidence and severity of gray leaf spot in perennial ryegrass |
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| Section: | Poster presentations
Other records with the "Poster presentations" Section
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| Meeting Info.: | Cook College, Rutgers, NJ: January 10-11, 2002 |
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| Source: | Proceedings of the Eleventh Annual Rutgers TurfgrassSymposium. 2002, p. 52. |
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| Publishing Information: | New Brunswick, NJ: Center for Turfgrass Science, Cook College, Rutgers, The State University of New Jersey |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Application timing; Disease incidence; Disease severity; Fertilizer evaluation; Gray leaf spot; Liming; Lolium perenne; Nitrogen fertilization
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| Cultivar Names: | Palmer II |
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| Abstract/Contents: | "Gray leaf spot, caused by the fungus Pyricularia grisea, has emerged as one of the most devastating diseases of perennial ryegrass in the United States. Though recent studies have shown that increased nitrogen rate can result in greater disease severity, little is known about the impact of nitrogen source and the frequency of fertilizer applications on disease development. In two concurrent studies conducted in 2001, the effect of nitrogen sources alone and in combination with lime on the incidence and severity of gray leaf spot was assessed on three-month old 'Palmer II' perennial ryegrass maintained at North Brunswick, NJ. In the first study, ammonium sulfate, calcium nitrate, urea, IBDU, and milorganite fertilizers were applied at weekly (12.2 kg N ha-1), bi-weekly (24.4 kg N ha-1), or monthly (48.8 kg N ha-1) intervals from 24 June to 14 September. Plots treated with ammonium sulfate or urea sustained 7 to 65% more disease than turf fertilized with calcium nitrate. Although the total amount of nitrogen applied per growing season was the same, weekly applications of ammonium sulfate or urea yielded a greater incidence and severity of gray leaf spot than either bi-weekly or monthly applications of the same fertilizers. When applied on a monthly basis, disease severity was greater on turf that received 48.8 kg N ha-1 versus the 24.4 kg N ha-1 rate of ammonium sulfate, urea, or IBDU. No such response was observed with calcium nitrate and results with milorganite were inconclusive. Turf quality was not significantly different among treated plots. In the second study, the acidifying fertilizer ammonium sulfate and the alkalinizing fertilizer calcium nitrate were applied bi-weekly (24.4 kg N ha-1) alone or in combination with lime (99, 198, and 396 kg CCE ha-1) or elemental sulfur (845 kg S ha-1) from 14 June to 14 September. On all rating dates, disease severity was reduced 50 to 76% on turf that received calcium nitrate versus ammonium sulfate. Compared to ammonium sulfate alone, ammonium sulfate plus lime (198 and 396 kg CCE ha-1) reduced symptom expression 26 to 53%, respectively. Conversely, the combination of calcium nitrate and the same rates of lime increased disease severity 25 to 50%, respectively, when compared to calcium nitrate alone. Sulfur treated plots sustained very little disease, but sulfur significantly reduced soil pH resulting in very low turf quality. Similarly, although unfertilized turf sustained almost no disease (i.e., 1 to 2% turf area infested with P. grisea), turf quality was poor." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Towers, G. W., W. Meyer, J. Heckman, and B. B. Clarke. 2002. Influence of nitrogen and liming on the incidence and severity of gray leaf spot in perennial ryegrass. Proc. Annu. Rutgers Turfgrass Symp. p. 52. |
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| Web URL(s):
https://turf.rutgers.edu/research/abstracts/symposium2002.pdf#page=53
Last checked: 02/06/2017
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 433 .R88 |
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