A recent Agronomy eUpdate article (September 18, 2015, issue No. 529) about the increased prevalence of pigweeds in Kansas this year has been taken out of context by many news reporting agencies, according Dallas Peterson, Weed Management Specialist and author of the article.
The article explained that the combination of wet weather this summer combined with the increase in glyphosate-resistant Palmer amaranth resulted in more pigweeds in Kansas soybean fields than in previous years. He emphasized that managing pigweeds in the future would likely require a more diversified weed control program and more timely applications.
Peterson indicated that this also would be true for the new technologies such as 2,4-D and dicamba-resistant soybeans, and that Palmer amaranth may not be controlled by these herbicides programs when applied to larger weeds beyond the recommended treatment stage.
Unfortunately, that was misinterpreted by some that the new technologies would not work, when in fact, these technologies should help in managing glyphosate-resistant weeds if used as part of a program and at the proper timing.
The original article can be accessed at: https://webapp.agron.ksu.edu/agr_social/eu_article.throck?article_id=703
Steve Watson, Agronomy eUpdate Editor