Yield Loss Prediction Tool for Field-Specific Risk Management of Asian Soybean Rust

Project Updates - Kentucky January 2007

USA, Lexington Kentucky - July 13th, 2007 (Joe Omielan) - Project Update

Soybean rust spores did not arrive in Central Kentucky until the end of the growing season but we were able to work with the disease in growth chambers during the winter months. The purpose of the study was to measure the impact of Soybean Rust on leaf photosynthetic rates. The following photos illustrate some of the procedures. The assistance of plant pathologists Drs. Brenda Kennedy and Don Hershman was invaluable.

photo of potted flowering soybean plants in test chamber

We obtained seeds of two recombinant inbred lines from Dr. Roger Boerma (University of Georgia) which differed in their resistance to SBR. One was susceptible and formed tan sporulating lesions while the other was resistant forming red brown lesions.

photo showing collecton of SBR spores

A cyclone spore collector was used to harvest spores from sporulating lesions on our “source” plants.

photo of plant pathologists Brenda Kennedy and Don Hershman examining rust samples in the lab

Brenda and Don are quantifying spore concentrations in our suspensions.

photo of Elena Prior tagging indvidual plants prior to inoculation

Elena is tagging the individual plants in the walk-in growth chamber before inoculation.

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