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ALERT: First soybean rust found on soybeans in Louisiana
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7/26/06 Updated 10:50 p.m.– The first Asian soybean rust on soybeans in Louisiana this year was confirmed in Rapides Parish today, and growers are being told to spray soybeans in R1 through R5 growth stages.
The infected soybeans are Group Vs and are at R7 growth stage, according to the Louisiana state commentary. This is the farthest west in the United States that soybean rust is active at the moment, and the northern-most point in Louisiana with rust.
In that commentary and in an e-mail to fellow soybean specialists, Louisiana State University plant pathologist Clayton Hollier said growers should consider spraying their soybeans as follows:
"The recommendation is for soybeans in the R1 through R5 growth stages and (that) have a good yield potential be treated with a rust fungicide. The fungicides for rust control have a triazole alone or in combination with a strobilurin. These products are listed in the 2006 Plant Disease Management Guide and are on the LSU AgCenter Rust Web site."
Currently, rust has been found on this year's soybeans in six counties in Alabama, Florida, Georgia and Louisiana. The rest of the finds have been on kudzu.
Don Hershman, University of Kentucky plant pathologist, told his listserv today that "considering that the incidence of soybean rust in the (LA) plot was 75 percent, this is a significant find. It suggests to me that we could soon see an upturn in soybean rust findings in the lower Midsouth in areas that have had disease-favorable weather recently."
Hershman said to note that "conditions have been very dry in much of Mississippi and Arkansas and portions of Louisiana. Thus, not all sections of the lower Midsouth have been favorable for soybean rust. The risk of soybean rust in KY is still very low at this time."
A total of 26 counties have reported rust this year and include five in Alabama, 12 in Florida, five in Georgia, three in Louisiana, and one in Texas.
Source: Louisiana commentary on www.sbrusa.net and Don Hershman listserv e-mail.
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