Organizing Committee


Poster Presentations


Poster Presentations


Foliar disease assessment: A benefit of the soybean rust sentinel plot network in New York

Presenter: G. C. Bergstrom

All authors and affiliations: G. C. BERGSTROM, M. E. McKellar, M. Swartwood, K. Richards, and K. Snover-Clift. Cornell University, Ithaca, NY

Asian soybean rust was not detected in New York in 2006. The consistent finding of Phakopsora-like spores (likely dead at time of deposition) in aerial spore traps in central New York from late July through early November suggests that atmospheric pathways exist for introduction of the live pathogen and, thus, justifies continued monitoring for rust in 2007. A side benefit of the state’s cooperative sentinel plot monitoring effort was the first statewide assessment of soybean for general foliar diseases in 2006. Nineteen sentinel plots (50 × 50-foot areas within commercial soybean fields) were monitored on a weekly basis from late June through September within 18 New York counties. Septoria brown spot (14 locations), downy mildew (13 locations), and bacterial pustule (12 locations) occurred widely. Bacterial blight (six locations) and frogeye leaf spot (four locations) were also observed. Alternaria leaf spot and mosaic symptoms associated with Alfalfa mosaic virus were each confirmed in single locations. Though the state experienced normal temperatures and the highest average rainfall (16.9 inches) ever recorded for June-August, foliar diseases were not severe in any sentinel plot. The sentinel network in New York is a cooperative venture of the USDA, Cornell University, Cornell Cooperative Extension, private industry, and state government. In addition to providing the New York soybean industry with an early detection and communication system for Asian soybean rust, the sentinel plot network also serves as a focal point for the assessment and communication of broader pest management issues affecting soybean production.

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