Field days to show field application of pigweed control practices

July 11, 2011
Contact Information:

Fred Bourland, Northeast Research and Extension Center, Keiser

Kenneth Smith, Southeast Research and Extension Center, Monticello

Howell Medders, Division of Agriculture Communications, Fayetteville

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KEISER, Ark. -- Field experiments and demonstrations on preventing and managing herbicide-resistant pigweed populations in cotton and soybean will be presented at University of Arkansas Division of Agriculture field days July 19 and 21. Both events will feature the field application of practices presented at the widely attended "Pigposium" in Forrest City last November, which focused on glyphosate-resistant pigweed.

Division of Agriculture weed scientists Kenneth Smith, Jason Norsworthy, Bob Scott and others will show research plots and demonstrate best practices during field tours starting at 9 a.m. at both events. Registration starts at 8 a.m.

A "Pigweed Fieldposium" Tuesday, July 19, will be on the Curtis Story farm at the cotton module yard on Hwy. 1 South in Marvell (Phillips County).

The Weeds Field Day at the Northeast Research and Extension Center at Keiser in Mississippi County will be on Thursday, July 21. Directions to NEREC are on the center's website at

"Resistant pigweed is a major issue for Arkansas farmers, and I expect a large turnout for both field days," said Smith, who is widely regarded as a national authority on managing resistant pigweed.

A lunch program at the NEREC field day will feature dedication of the Hardy-Caviness Greenhouse Complex built with funds from area donors.

Field day topics at NEREC will include:
-- Program approaches to effective pigweed management in cotton,
-- Use of residual herbicides in cotton,
-- Use of a wiper applicator for pigweed escapes,
-- Use of a bedder/incorporator to make residual herbicides more reliable,
-- Weed control in Roundup Ready and Liberty Link soybean systems,
-- Spray nozzle/volume selection for effective herbicide application, and
-- Comparison of soil seedbank in Roundup Ready and Liberty Link programs.

"There is no silver bullet, but our weed scientists have put together an effective systems approach to managing resistant pigweed populations," said Fred Bourland, NEREC director.

Field day visitors will see a soybean plot where only Roundup has been applied for the last three years. Farmers will not be surprised to see that the plot is full of pigweed, Bourland said.