November
2008
, Volume
92
, Number
11
Pages
1,551
-
1,558
Authors
Wayne M. Jurick II, Postdoctoral Research Associate, University of Florida, Gainesville 32611;
Dario F. Narvaez, Postdoctoral Research Associate, University of Florida -- NFREC Quincy 32351;
Meghan M. Brennan, IFAS Statistics, University of Florida, Gainesville;
Carrie L. Harmon, Associate Director, Southern Plant Diagnostic Network, Gainesville, FL 32611;
James J. Marois, Professor of Plant Pathology, and
David L. Wright, Professor of Agronomy, University of Florida -- NFREC, Quincy; and
Philip F. Harmon, Assistant Professor of Plant Pathology, University of Florida, Gainesville
Affiliations
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RelatedArticle
Accepted for publication 2 July 2008.
Abstract
ABSTRACT
Soybean rust (SBR) survival and host availability (kudzu, Pueraria spp.) were assessed from November 2006 through April 2007 at six sites from the panhandle to southwest Florida. Micro loggers recorded both temperature and relative humidity hourly at each location. Periods of drought and cumulative hours below 0°C correlated with kudzu defoliation. Inoculum potential from detached kudzu leaves was evaluated in vitro under various temperature and relative humidity levels. Kudzu leaves with SBR kept at 4°C produced viable urediniospores with the highest germination at all moisture levels over time. Freezing temperatures (--4 and --20°C) drastically reduced spore germination. However, when leaves were incubated at low (<35%) relative humidity, inoculum potential was prolonged. Results from this study demonstrate that both temperature and relative humidity impact P. pachyrhizi in the field and in vitro, and that detached kudzu leaves have the potential to serve as an inoculum source in kudzu stands.
JnArticleKeywords
Additional keywords:infection efficiency, over wintering
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ArticleCopyright
© 2008 The American Phytopathological Society
