Your Help Needed to Identify Palmer Amaranth Distribution in Nebraska

Your Help Needed to Identify Palmer Amaranth Distribution in Nebraska September 2, 2016

In an effort to improve local weed management and educational efforts, Nebraska Extension would like to determine the distribution of Palmer amaranth across Nebraska counties and assess those populations for potential multiple-resistance to various herbicide site-of-action groups. We are asking producers, agronomists, and others with a knowledge of local weeds to complete a short (less than five-minute) survey by September 9: Palmer Amaranth Distribution and Potential Resistance Survey. The survey is mobile-friendly (smart phone, tablet).

Palmer amaranth can be one of the most problematic weeds in Nebraska cropping systems. Even though Palmer amaranth has been present in Nebraska for several decades, it has been spreading to new areas across Nebraska. Sometimes Palmer amaranth is misidentified as common waterhemp (Figure 1), so there is a link in the survey explaining how to tell the difference between the two pigweed species. Additionally, multiple-resistance was recently confirmed in Palmer amaranth in a Nebraska seed corn field.

Thank you for helping us gain a better understanding of Palmer amaranth distribution and herbicide resistance in Nebraska!

Palmer amaranth and common waterhemp leaves
Figure 1. Palmer amaranth leaf and petiole on the bottom and common waterhemp (leaf and petiole) on the top.