2005 Year in Review

From the Fields – Soybean Rust

Asian soybean rust, a fungal disease, is a serious pest that causes pustules (similar to small volcanoes) on the leaves and eventually defoliation of the plants. Reports from other countries have indicated up to 80% yield reduction as a result of premature defoliation, poor seed set and seed fill. The disease was first reported in the continental US in November 2004 and is spread by wind-borne spores.

If Asian soybean rust is suspected, collect 20 leaflets with the suspected symptoms. They should be placed flat, dry, and between dry paper towels. Leaflets should be packaged in two layers in zip lock plastic bags. Using a permanent marker indicate date, collector’s name and phone number, collection location within the field, location of the field, county, township, and section, and the nearest intersection. GPS information is helpful if available. Place the samples and bag in a second zip lock bag. Submit samples to the University of Illinois Distance Diagnostics through Digital Imaging (DDDI) system located at Extension unit offices. If the sample cannot be delivered immediately, keep it refrigerated until delivery to reduce plant deterioration. Digital images will be submitted by the Extension unit office and diagnosis will be emailed back to the Extension unit within a few hours.

If the DDDI sample appears suspect, the plant sample will be submitted via overnight mail to the University of Illinois Plant Clinic. A mailing fee will be charged prior to the first detection of Asian soybean rust in Illinois.

There is no charge for DDDI samples and the Plant Clinic fee ($12.50) is paid by the Illinois Soybean Program Operating Board if the sample is pre-screened by the DDDI system. Following confirmation of Asian soybean rust in Illinois, continue to scout fields and submit samples following the above mentioned procedure. Overnight delivery will not be required and all testing will be done within state.

Further information on Asian soybean rust is available at Extension unit offices.

by  Editor, theCity1.com
April 19, 2005