"Crop-devouring armyworms are showing increasing resistance in some U.S. farm fields to a popular type of genetically modified crop that should kill them, scientists said on Monday.

The evolution of insect resistance "is a great threat" long- term to the sustainability of the GMO crop biotechnology that has become a highly valued tool for many U.S. farmers, according to Fangneng Huang, an entomologist at Louisiana State University (LSU) and lead researcher for a three-year study.

The study was published on Monday in the PLOS One online journal (www.plosone.org [2]) for peer-reviewed research, after being presented at the Entomological Society of America annual meeting in Portland, Oregon."

Carey Gillam reports for Reuters November 17, 2014. [3]