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11

Phakopsora pachyrhizi urediniospore escape from a soybean canopy

Presenter: J. M. Zidek

All authors and affiliations: J. M. ZIDEK (1), S. A. Isard (1), E. D. DeWolf (1), J. J. Marois (2), and D. L. Wright (2). (1) Department of Plant Pathology, The Pennsylvania State University, University Park, PA 16802; and (2) University of Florida, North Florida Research and Education Center, Quincy, FL 32351

Predicting the potential arrival of soybean rust through the use of aerobiological modeling may help growers decide if a fungicide application is needed. Many of the variables that govern the aerobiological transport of Phakopsora pachyrhizi from one location to another are well understood. However, P. pachyrhizi spore escape from a soybean canopy is a poorly understood aspect of the modeling process. The objectives of this research were to estimate the proportion of released P. pachyrhizi spores that escape a soybean canopy and relate this value to atmospheric turbulence. Spores were collected for 15-min intervals near the center of a severely diseased field of soybeans at the University of Florida, North Florida Research and Education Center in Quincy, FL. Rotorod samplers were placed on four vertical towers at heights relative to canopy height, H, at the following levels: 0.5, 1.0, 1.5, and 2.5 H. The towers were situated in a 3.0 3.0-m square. Atmospheric turbulence was measured using a three-dimensional sonic anemometer (CSAT3). A total of 12 experimental trials was conducted from August 2228, 2006. The measurements indicated that, as atmospheric turbulence increased, the proportion of released spores that escaped a soybean canopy increased. Further research is ongoing with the objective of relating the escaped proportion of released spores to canopy structure as well.

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