Posted on March 2, 2017 by rhallberg
Waterhemp has been locked in an arms race with farmers for decades. Nearly every time farmers attack the weed with a new herbicide, waterhemp becomes resistant to it, reducing or eliminating the efficacy of the chemical. Some waterhemp populations have evolved resistance to multiple herbicides, making them incredibly difficult to kill.
Adding to the challenge is the fact that waterhemp can evolve resistance in at least two ways. In target-site resistance, a gene mutation changes the protein that the herbicide is designed to attack. With an ill-fitting protein binding site, the herbicide becomes ineffective. The plus side of target-site resistance is that it is relatively easy to identify using standard lab procedures. Continue reading
Filed under: news | Tagged: atrazine, atrazine resistance, resistance, resistant waterhemp, waterhemp | Leave a comment »
Posted on February 17, 2017 by rhallberg
in Southwest Farm Press
South Texas, or coastal Texas, is a unique region of the greater Southwest, marked by a sub-tropical climate, unique soils and a host of both advantages and disadvantages when it comes to agriculture.
The warmer climate allows for an extended growing season, and its relationship with the tropical Gulf of Mexico offers some clear advantages, like seasonal rains, but also unique challenges, not the least of which is an environment conducive to the rapid growth and propagation of noxious and damaging weed varieties. Continue reading
Filed under: news | Tagged: Crop rotation, herbicide resistance, herbicide rotation, pigweed, waterhemp, weed control | Leave a comment »
Posted on December 16, 2016 by rhallberg
In Delta Farm Press
by David Bennett
It’s that time of year when the migration of waterfowl has begun and hunters unlock the gun cabinet and pull on camo. It turns out those wonderful ducks may be carrying more than the odd band and a desire for warmer climes.
Is the rapid spread of herbicide-resistant pigweeds in the Mid-South at least partially attributable to the flyway? A recent study out of Missouri says it is quite likely. Continue reading
Filed under: news | Tagged: Palmer amaranth, pigweed, University of Missouri, waterfowl, waterhemp | Leave a comment »
Posted on August 8, 2014 by rhallberg
In Delta Farm Press (with a video)
Farmers in the Mid-South and Southeast have spent a lot of money – and, in some cases, have lost entire fields – because of the development of resistance to glyphosate in prolific seed-producing weeds like Palmer amaranth or pigweed.
But how much will it cost them in added herbicide and labor expense and crop losses when weeds like pigweed or common waterhemp develop resistance to more than two or three or even more herbicide modes of action?
Filed under: news | Tagged: Aaron Hager, herbicide resistance, multiple resistance, Palmer amaranth, pigweed, University of Illinois, waterhemp | 1 Comment »
Posted on March 19, 2014 by rhallberg
From Southeast Farm Press
Renowned weed scientist Steve Powles, having had to find solutions and work-arounds in resistant weed-infested crops in his native Australia, has tried to prepare American producers for their own burgeoning resistance problems.
Filed under: news | Tagged: Aaron Hager, herbicide resistance, pigweeeds, roundup ready, seed bank, Steve Powles, waterhemp | Leave a comment »
Posted on March 19, 2014 by rhallberg
From Delta Farm Press
At this point, the confirmation of a new glyphosate-resistant weed is unlikely to raise eyebrows. However, nonchalance is hardly the suitable reaction when considering the implications of what USDA-ARS researchers have uncovered in a Mississippi cotton field in Lafayette County.
Filed under: news | Tagged: Amaranthus, Bill Molin, glyphosate resistance, herbicide resistance, Lafayette County, Mississippi State University, Palmer amaranth, spiny amaranth, Stoneville, USDA ARS, waterhemp | Leave a comment »
Posted on November 11, 2013 by rhallberg
In the Missouri Ruralist
Responding to the first known report of waterhemp showing resistance to HPPD (4-hydroxyphenylpyruvate dioxygenase)-inhibiting herbicides, such as Callisto, Impact, and Laudis, weed science researchers at the University of Illinois have identified two unique mechanisms in the plant that have allowed the weed to “get around” these herbicides.
Filed under: news | Tagged: agriculture, atrazine, farming corn, herbicide-resistant weeds, HPPD-inhibiting herbicides, University Extension, University of Illinois, waterhemp | Leave a comment »