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| Web URL(s): | http://archive.lib.msu.edu/tic/mitgc/article/198558b.pdf
Last checked: 02/09/2009
Requires: PDF Reader |
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| Publication Type:
| Proceedings |
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| Author(s): | Otto, M. E.;
Vargas, J. M. Jr.;
Detweiler, R. |
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| Author Affiliation: | Department of Botany Plant Pathology, M.S.U. |
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| Title: | Irrigation and fertility effects on Helminthosporium melting-out and dollar-spot |
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| Meeting Info.: | East Lansing, Michigan: January 22-23, 1985 |
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| Source: | Proceedings of the 55th Annual Michigan Turfgrass Conference. Vol. 14, 1985, p. 58, 60-61. |
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| Publishing Information: | East Lansing, MI: Michigan State University |
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| # of Pages: | 3 |
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| Keywords: | TIC Keywords: Fertilization; Drechslera poae; Application timing; Poa pratensis; Melting out
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| Abstract/Contents: | Discussion of research conducted on effects of irrigation and fertility on Helminthosporium melting-out and dollar spot. A timing study was initiated in 1983 and 1984 on Kentucky bluegrass maintained at 1.5 inches. The following rates of nitrogen were foliarly applied: three spring and fall 2.3 lbs N/1000 sq ft/for duration of study (FDS); urea spring only 1.3 lb N/100 sq ft/FDS; urea fall only 1 lb N/1000 sq ft/FDS; check. Results of this study indicate that Helminthosporium melting-out can be significantly reduced by moderate levels of dormant spring fertility. Based on this study, two spring applications of .75 to 1 lb N would provide best preventive management of Helminthosporium melting-out and dollarspot. In the first a 3x3x10 split-plot factorial study including 3 replications, 3 irrigations, and 10 chemical subcycles was conducted in Kentucky bluegrass to primarily test for differences in Helminthosporium melting-out and irrigation regime. Irrigation treatments consisted of 20 minutes daily irrigation at noon, 80% of pan replacement, no supplemental irrigation. All plots were rated for leaf lesions within 3-inch diameter ring. Three subsamples were counted per plot. The results and analysis of variance indicate that there is significance with the chemical treatments, but that no significant difference for the irrigation treatment. Green margin fertilizer treatments resulted in less disease than the check while Lawnkeeper and Lawn Rx did not. Although no significance was shown for the irrigation treatment the trend appears that less disease in daily irrigated areas than is less frequently watered areas. The second was conducted on Poa annua and also was a 3x3x10 (three replications, three irrigations, and 10 chemical subplots) split-plot factorial study. This study was conducted to determine the development of dollarspot under three different irrigation regimes. Irrigation treatments consisted of 75% pan replacement, 110% of pan three times weekly, and irrigation at wilt. All plots were rated and number of diseases spots counted and analysis of data indicate that irrigation had significant effect on development of dollarspot, with daily irrigation displaying highest disease with 110% pan second with irrigation at wilt lowest. |
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| Language: | English |
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| References: | 0 |
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| See Also: | Updated version appears in News Notes [Michigan Turfgrass Foundation], April-June 1985, p. 4-6, R=260132. R=260132 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Otto, M. E., J. M. Jr. Vargas, and R. Detweiler. 1985. Irrigation and fertility effects on Helminthosporium melting-out and dollar-spot. p. 58, 60-61. In Proceedings of the 55th Annual Michigan Turfgrass Conference. East Lansing, Michigan: January 22-23, 1985. East Lansing, MI: Michigan State University. |
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| Web URL(s):
http://archive.lib.msu.edu/tic/mitgc/article/198558b.pdf
Last checked: 02/09/2009
Requires: PDF Reader |
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MSU catalog number: SB 433 .A1 M47 |
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