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231225s2017 xx |||||o 00| ||eng c |
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|a 10.1094/PDIS-02-17-0165-RE
|2 doi
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|a eng
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| 100 |
1 |
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|a Jordan, Brian S
|e verfasserin
|4 aut
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| 245 |
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|a Late Leaf Spot Severity and Yield of New Peanut Breeding Lines and Cultivars Grown Without Fungicides
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|c 2017
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| 336 |
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|a Text
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|a ƒaComputermedien
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|a Date Completed 16.04.2019
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|a Date Revised 16.04.2019
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Peanut (Arachis hypogaea) cultivars with resistance or tolerance to Cercospora arachidicola and/or Cercosporidium personatum, the causes of early and late leaf spot, respectively, are needed for organic production in the southeastern U.S. To determine the potential of new breeding lines for use in such production systems, field experiments were conducted in Tifton, GA, in 2014 and 2015 in which nine breeding lines and two cultivars, Georgia-06G and Georgia-12Y, were grown without foliar fungicide applications. In one set of trials, cultivar Georgia-12Y and most of the breeding lines evaluated had early season vigor ratings, early-season canopy width measurements, final plant populations, and pod yield that were greater than those of standard cultivar Georgia-06G. In those trials, final late leaf spot Florida scale ratings were lower and canopy reflectance measured as the normalized difference vegetation index (NDVI), was higher all the breeding lines than those of Georgia-06G. In another set of trials, two of those same breeding lines had final late leaf spot ratings similar to those of Georgia-12Y in 2014, whereas in 2015, six of those breeding lines had final leaf spot ratings that were lower than those of Georgia-12Y. Yields were similar for Georgia-12Y and all the breeding lines in the Gibbs Farm trials. Across years and breeding lines at the Lang Farm, the relationship between visual estimates of defoliation and NDVI was described by a two sector piecewise regression with NDVI decreasing more rapidly with increasing defoliation above approximately 89%. The utility of NDVI for spot comparisons among breeding lines appears to be limited to situations where there are differences in defoliation. Georgia-12Y and multiple breeding lines evaluated show potential for use in situations such as organic production where acceptable fungicides available for seed treatment and leaf spot control are limited
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|a Journal Article
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|a Fungicides, Industrial
|2 NLM
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|a Culbreath, Albert K
|e verfasserin
|4 aut
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|a Brenneman, Timothy B
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kemerait, Robert C
|c Jr
|e verfasserin
|4 aut
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| 700 |
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|a Branch, William D
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Plant disease
|d 1997
|g 101(2017), 11 vom: 24. Nov., Seite 1843-1850
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|g pages:1843-1850
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|u http://dx.doi.org/10.1094/PDIS-02-17-0165-RE
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