Amit Jhala | Nebraska Extension Weed Management Specialist
Palmer amaranth, a member of the pigweed (Amaranthaceae) family, is one of the most troublesome weeds in corn and soybean production fields in Nebraska. Of particular concern is Palmer amaranth resistant to glyphosate in south-central and west-central Nebraska.
To share research information on this topic, a Glyphosate-resistant Palmer amaranth Management Field Day was held July 10 near Carleton, Nebraska. Amit Jhala, associate professor of agronomy and horticulture and extension weed management specialist, organized and led the tour. A total of 125 were in attendance including growers, crop consultants, extension educators, administrators, graduate students, industry representatives and other clientele.
Jason Norsworthy, an endowed chair and professor of weed science at the University of Arkansas, was an invited speaker. He discussed Palmer amaranth identification, biology and management in corn and soybean.
Jhala and team members demonstrated several projects for control of glyphosate-resistant Palmer amaranth in soybean and looked at efficacy, crop safety and comparison of new herbicides in the University of Nebraska–Lincoln’s unbiased comparison trials. Jhala’s research graduate students talked about their projects. Shawn McDonald discussed “How Row Spacing and Herbicide Programs can Affect Glyphosate-resistant Palmer Amaranth Control in Dicamba-resistant Soybean.” Jose Henrique Sanctis discussed “Critical Period of Palmer Amaranth Removal Affected by Residual Herbicides.” Jasmine Mausbach discussed weed control and crop safety in Liberty Link/GT27 soybean (resistant to isoxaflutole, glyphosate, and glufosinate.)
The field day was a part of the research and extension grant Jhala received from Nebraska Soybean Board. The weed science team thanks Ethann Barnes, Jenny Rees, Adam Striegel, Adam Leise, Sharon Hachtel, Irvin Schleufer, Will Neel and Jared Stander for their assistance. The team also thanks Lana Johnson, Wendy Morrissey and Connie Hansen for their help with online registration, CCA credits and developing promotional material.