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| Web URL(s): | http://www.apsnet.org/publications/phytopathology/backissues/Documents/1987Articles/Phyto77n05_715.pdf
Last checked: 10/15/2015
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Sherwood, R. T. |
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| Author Affiliation: | Plant pathologist, U.S. Dept. of Agriculture, Agricultural Research Service, U.S. Regional Pasture Research Laboratory, University Park, PA. |
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| Title: | Weibull Distribution of Lesion Size in the Stagonospora Leaf Spot of Orchardgrass |
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| Source: | Phytopathology. Vol. 77, No. 5, May 1987, p. 715-717. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Dactylis glomerata; Genotypes; Disease control; Disease identification
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| Abstract/Contents: | "Five resistant and five susceptible genotypes of Dactylis glomerata were inoculated with Stagonospora arenaria in two replicated greenhouse tests. Distributions of lesion length and area were determined for populations of lesions on single leaves, using samples of 50 lesions per leaf. The two trials gave closely similar results. The null hypothesis that size was normally distributed could be rejected for resistant genotypes but not for suceptible, using the Shapiro-Wilk w statistic at P=0.01. The sample of all genotypes showed positive skewness (tail to the right). The lognormal distrbution could be rejected in favor of the Weibull distribution in all samples at a=0.01. all samples showed a good fit to the Weibull distribution with location (a) set a minimum spot size. Weibull maximum likelihood estimates for shape (c) were significantly lower than C expected for a normal distribution; this further demonstrated positive skewness. Values for a, c, and slope (b) were significantly lower for resistant genotypes than for susceptible genotypes. Two additional tests with other genotypes gave the same trends." |
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| Language: | English |
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| References: | 22 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Sherwood, R. T. 1987. Weibull Distribution of Lesion Size in the Stagonospora Leaf Spot of Orchardgrass. Phytopathology. 77(5):p. 715-717. |
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| Web URL(s):
http://www.apsnet.org/publications/phytopathology/backissues/Documents/1987Articles/Phyto77n05_715.pdf
Last checked: 10/15/2015
Requires: PDF Reader |
| 
MSU catalog number: SB 599 .P48 |
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