Roundup-Resistant Pigweed And Johnsongrass Now A Reality In Louisiana

Until just the last year or so, Louisiana has mostly dodged the bullet when it came to Roundup-resistant weeds, especially two severe problems: resistant pigweed and resistant johnsongrass.

But events caught up with the state, and Louisiana State University weed scientists have been confirming more cases of known resistance.

"The delayed development of glyphosate-resistant weeds in Louisiana may be related to our cropping systems and weed control programs, which have included use of soil-applied herbicides at planting and combinations of glyphosate with other herbicides," according to a brief overview paper issued by James L. Griffin and Daniel O. Stephenson, IV, Weed Scientists, Louisiana State University. "The lag period has allowed us to learn from what has happened in other states, to aggressively educate our producers and to promote weed control programs that prevent or delay development of glyphosate-resistant weeds."

Here's a link to their full report.