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Typical appressorium of Phakopsora pachyrhizi. Appressorium (top) arising from germinating urediniospore (bottom).
Breno Leite, Jim Marois, and David Wright
NFREC-IFAS- University of Florida.
Email: bleite@ufl.edu
Host: Soybean. Glycine max
Disease name: Asian soybean rust
Pathogen name: Phakopsora pachyrhizi
Dark field image shows the typical appressorium formed by Phakopsora pachyrhizi. Image was obtained through the use of an artificial hydrophobic surface polystyrene covered slide (Leite, B. & Nicholson, R.L. 1992. Exp. Mycology 16: 76-86). The Southeast is the first U.S. landfall site for numerous documented plant and animal diseases. ASR (Asian Soybean Rust) was on the USDA's "select agent" list, and had not been reported in the U.S. until November 6, 2004. Hurricane Ivan is believed to be the means by which ASR entered the U.S. ASR is now established in Florida and threatens our national soybean industry. ASR cannot be eradicated and it infects over 90 legume species. UF/IFAS has joined the other southeastern States to track its survival and movement on a regular basis and provide information to the national soybean industry for management decisions. Long-term, sustainable solutions to the control of this disease must be developed. This is a model plant host system for pests and diseases that threaten our nation's agriculture.
APS publication number: IW000065
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