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| Web URL(s): | http://www.apsnet.org/publications/PlantDisease/BackIssues/Documents/1983Articles/PlantDisease67n10_1080.pdf
Last checked: 10/13/2015
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Cahill, J. V.;
Murray, J. J.;
O'Neill, N. R.;
Dernoeden, P. H. |
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| Author Affiliation: | Department of Agronomy, University of Maryland, College Park |
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| Title: | Interrelationships Between Fertility and Red Thread Fungal Disease of Turfgrass |
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| Source: | Plant Disease. Vol. 67, No. 10, October 1983, p. 1080-1083. |
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| Publishing Information: | St. Paul, Minn., American Phytopathological Society |
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| # of Pages: | 4 |
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| Keywords: | TIC Keywords: Nitrogen; Lolium perenne; Phosphorus
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| Abstract/Contents: | In field plots treated with nitrogen (N), potash (K), and phosphorus (P), only 291 kg N/ha (highest rate of ammonium nitrate) in both 1980 and 1981 showed a significant (P = 0.05) reduction in severity of red thread foliar disease of perennial ryegrass (Lolium perenne) caused by Laetisaria fuciformis. Data in 1981 showed a significant (P = 0.05) N x K interaction whereby disease severity was reduced using intermediate levels of nitrogen (194 kg N/ha) and potassium (135 kg K/ha). Significantly (P = 0.05) lower disease severity ratings were observed in plots fertilized with 291 kg N/ha. Red thread disease severity was highest in plots treated with 98 kg N/ha (lowest rate used), regardless of the potassium level. Applications of phosphorus did not appear to affect disease severity. tissue analysis showed a decrease in disease severity as potassium and nitrogen content increased in leaf tissue. Disease incidence and severity was higher in plots fertilized with the lowest level of nitrogen (98 kg N/ha) when foliar calcium content was low. At higher nitrogen levels (291 kg N/ha), disease severity increased with foliar calcium content. There was no apparent effect of phosphorus or potassium nutrition on turf quality. Best turf quality was achieved in plots receiving 291 kg N/ha; however, 194 kg N/ha produced acceptable turf quality for home lawns. Small amounts of nitrogen (24 and 49 kg N/ha) as single applications effectively reduced the severity of naturally occurring red thread disease within 1 month of application, but turf treated with only hydrated lime and potassium showed no significant reduction in red thread disease. |
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| Language: | English |
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| References: | Unknown |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Cahill, J. V., J. J. Murray, N. R. O'Neill, and P. H. Dernoeden. 1983. Interrelationships Between Fertility and Red Thread Fungal Disease of Turfgrass. Plant Dis. 67(10):p. 1080-1083. |
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| Web URL(s):
http://www.apsnet.org/publications/PlantDisease/BackIssues/Documents/1983Articles/PlantDisease67n10_1080.pdf
Last checked: 10/13/2015
Requires: PDF Reader |
| 
MSU catalog number: SB 599 .P95 |
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