Soybean rust confirmed in Louisiana soybeans

Asian soybean rust (ASR) has been confirmed in Louisiana in a sentinel plot at LSU’s research and education center in Alexandria. David Lanclos, Louisiana Soybean Specialist, said the find was made Tuesday in MG V soybeans. An adjoining sentinel plot of MG IV beans had been harvested just prior to the discovery.

“It’s pretty much all over the sentinel plot,” Lanclos said.

About 70% of the state’s crop is out of danger, he estimated this morning. Some early planted dryland beans already are being harvested. About 240,000 acres, however, are still at vulnerable stages, Lanclos said. Most of those are in south Louisiana. Lanclos added. The bulk of these beans, he said, are found in the following parishes: Jeff Davis, Rapides, St. Landry, Avoyelles, Pointe Coupee and Evangeline.

Rainfall over the last 2 weeks has spurred development and movement, Lanclos said. As we filed this report, a tropical system was bringing more rain to south Louisiana.

“If you have a crop to protect between R1 and R5, we recommend treatments,” Lanclos said. “Before you make that fungicide application, contact someone with experience in material selection. There are any number of products, along with combinations that have varying amounts of one compound or another. The thing we have to remember is that there are other diseases that have to be considered, so select materials or combinations that will give you optimum protection.”

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