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.

Don't Get Behind With Roundup-Resistant Pigweed, Says Arkansas Farmer

From February's National Conservation Cotton and Rice Conference in Baton Rouge, Louisiana:

Wayne Wiggins, of Arkansas, said herbicide-resistant pigweed appeared on his farm rapidly. “I was just stunned at how fast it came on.” He said it’s important to talk with neighbors about their weed problems and be prepared for resistance issues. 

“You’ve got a narrow window. When you get behind, you are over and done.” Wiggins said he uses atrazine on corn for its residual effects. “I’ll use a residual on all my bean fields this year.” 

He said rice is a good rotation crop to address pigweed, but the weed must be controlled on levees.

Source: Bruce Schultz, LSU Ag Center

Hooded Sprayer From Wilmar Aimed Directly At Roundup-Resistant Weed Control

Hooded sprayers were left to rust and rot in the weeds after Roundup Ready became the dominant weed control measure in cotton and other crops in the South.

Now, though, with the shift toward more Roundup-resistant weeds, hooded sprayers have been reentering fields, and more units are being sold.

Roundup-Resistant Ryegrass: Mississippi Schedules Symposium For March 10

Mississippi farmers are a few years into the fight against glyphosate-resistant weeds, a problem that is the focus of a March 10 field day in Stoneville.

Producers will take a close look at ways to manage herbicide resistance in the Glyphosate-Resistant Ryegrass Field Day at Mississippi State University’s Delta Research and Extension Center in Stoneville. Registration begins at 7:30 a.m. at the Capps Center, and the field day concludes with lunch. The program will move indoors if there is bad weather.

Conventional Cotton Herbicide Control: One Approach

Editor's Note: Rusty Harris, Extension Agent in Worth County, Georgia, developed the following systems approach for his farmers who want to grow cotton that lacks herbicide resistance traits:

This program should provide adequate control of palmer amaranth, ipomea morningglory species, yellow nutsedge, bristly starbur, and tropic croton.