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Issue No. 18, Article 5/July 27, 2007

Soybean Rust Recently Found in Arkansas

Soybean rust was detected in southwestern Arkansas earlier this week. The find, in Little River County on soybean in the R4 to R5 growth stage, is the furthest north that soybean rust has been detected so far this year. Thus far in 2007, soybean rust has been found in Arkansas, Texas, Louisiana, Mississippi, Alabama, Georgia, Florida, and Mexico. The majority of soybean fields in Illinois are currently in the reproductive stages. Research has indicated that soybean plants in those stages are most susceptible to soybean rust but that infections that take place after the R5 growth stage (beginning seed) cause negligible yield loss. Now that soybean rust has moved northward, it is important to scout fields and to be aware of soybean rust's distribution in the U.S. through the soybean rust PIPE Web site (www.sbrusa.net). Refer to the article by Suzanne Bissonnette in issue 14 of the Bulletin for more information about scouting for soybean rust.

Distribution of soybean rust in North America on July 24, 2007 (from the soybean rust PIPE Web site at www.sbrusa.net).

--Carl A. Bradley

Carl A. Bradley

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