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| DOI: | 10.1094/ATS-2011-1223-02-RS |
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| Web URL(s): | https://dl.sciencesocieties.org/publications/ats/articles/8/1/2011-1223-02-RS
Last checked: 03/05/2014
Access conditions: Item is within a limited access website
https://dl.sciencesocieties.org/publications/ats/pdfs/8/1/2011-1223-02-RS
Last checked: 03/05/2014
Requires: PDF Reader
Access conditions: Item is within a limited access website |
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| Publication Type:
| Refereed |
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| Author(s): | Ryan, C. P.;
Dernoeden, P. H.;
Grybauskas, A. P.;
Momen, B. |
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| Author Affiliation: | Ryan, Dernoeden and Grybauskas: Department of Plant Science and Landscape Architecture; Momen: Department of Environmental Science and Technology, University of Maryland, College Park, MD |
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| Title: | Influence of summer spoonfeeding six nitrogen sources on dollar spot severity and chlorothalonil efficacy in creeping bentgrass |
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| Section: | Applied turfgrass research
Other records with the "Applied turfgrass research" Section
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| Source: | Applied Turfgrass Science. December 23 2011, p. 1-9. |
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| Publishing Information: | Plant Management Network |
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| # of Pages: | 9 |
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| Related Web URL: | https://dl.sciencesocieties.org/publications/ats/abstracts/8/1/2011-1223-02-RS
Last checked: 03/05/2014
Notes: Abstract only |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Chlorothalonil; Disease severity; Dollar spot; Fungicide evaluation; Nitrogen fertilization; Spoon feeding; Summer maintenance
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| Abstract/Contents: | Dollar spot (Sclerotinia homoeocarpa F.T. Bennett) injury can be suppressed by applications of nitrogen fertilizer to creeping bentgrass (Agrostis stolonifera L.). Previous studies evaluated applications of relatively high rates of nitrogen (? 24 kg N/ha) for dollar spot suppression. In this study, ammonium nitrate, ammonium sulfate, urea, potassium nitrate, calcium nitrate, and 20-20-20 were applied to fairway height creeping bentgrass on two week intervals at 7.3 kg N/ha in 2008 and 2009. The N sources were applied alone or tank-mixed with a low rate of the contact fungicide chlorothalonil (1.6 kg a.i./ha in 2008 and 3.2 kg a.i./ha in 2009). It was hypothesized that N + chlorothalonil would improve the level or longevity of dollar spot control compared to chlorothalonil alone. Treatments were initiated prior to the onset of dollar spot symptoms. Area under the disease progress curve data revealed that only ammonium sulfate had reduced dollar spot in both years, whereas ammonium nitrate and 20-20-20 did not reduce dollar spot over the season in any year. There was a trend for less dollar spot control in plots treated with N + chlorothalonil versus the low chlorothalonil rate alone in 2008, but in 2009 the deleterious effect was significant. It is likely that N stimulated plant growth and thus the contact fungicide was more rapidly removed from plants by mowing or there was more unprotected tissue for a longer period compared to plots treated with chlorothalonil alone. Ammonium nitrate, urea and 20-20-20 were not injurious. Potassium nitrate and calcium nitrate caused a short-lived tip burn, but ammonium sulfate elicited a severe burn since the N sources were not watered-in immediately. |
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| Language: | English |
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| References: | 16 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ryan, C. P., P. H. Dernoeden, A. P. Grybauskas, and B. Momen. 2011. Influence of summer spoonfeeding six nitrogen sources on dollar spot severity and chlorothalonil efficacy in creeping bentgrass. Appl. Turfgrass Sci. p. 1-9. |
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| DOI: 10.1094/ATS-2011-1223-02-RS |
| Web URL(s):
https://dl.sciencesocieties.org/publications/ats/articles/8/1/2011-1223-02-RS
Last checked: 03/05/2014
Access conditions: Item is within a limited access website
https://dl.sciencesocieties.org/publications/ats/pdfs/8/1/2011-1223-02-RS
Last checked: 03/05/2014
Requires: PDF Reader
Access conditions: Item is within a limited access website |
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