“We’ve tested Synergized Ametryn in 100 locations in 11 states over 14 seasons, and we’ve never had a control failure.” “The half-life of Ametryn is 52 days, and the post application took place about five weeks after planting,” said Walker. “We cleaned up that field with Ametryn, Explorer (a generic mesotrione) and metolachlor.” (Steve Dixon)ĭixon pulled up a three-foot-tall dead pigweed, something few farmers have seen since Palmer amaranth became resistant to glyphosate in the early 2000s, from the last sprayed area. Steve Dixon holds a dead pigweed found in one of his cornfields that was treated with a Synergized Ametryn program in 2022. (He planted 940 acres of corn this spring as part of his annual 50-50 rotation with soybeans.)” “We followed that five to seven weeks later with 3 ounces of Explorer, 1 pint of Me-Too-Lachlor and 1 pint of MSO. “We applied 1.5 pounds of Ametryn, 3.5 ounces of Explorer, 12.8 ounces of Roundup and 12.8 ounces of Weedmaster per acre on all of our corn about a week before we started planting on April 15,” Dixon said. Walker suggested a two-step plan using Synergized Ametryn. Ray, who had used Synergized Ametryn on his farm for four years, recommended he contact Walker.
Walker says Ametryn, which he thinks has been overlooked for years, could be the answer to those growing resistance problems.ĭixon was looking for answers to his pigweed problem when he talked to Jerry Ray, a former Swisher Sweets Sunbelt Farmer of the Year for Tennessee, last fall. He and other researchers have begun asking if farmers are nearing the end of an era in herbicides. Larry Steckel, professor of weed science at the University of Tennessee, has reported control failures in greenhouse screenings with higher rates of dicamba and 2,4-D on Palmer amaranth this year. He believes using ametryn, a compound developed in the 1960s, along with HPPD inhibitors such as Balance or mesotrione can be a game changer for farmers who face increasing levels of herbicide resistance in weeds like Palmer amaranth.ĭr. Walker holds beneficial interest and rights to the patent on Synergized Ametryn, which he has been working to develop commercially for 14 years. The different approach was Synergized Ametryn, which was recommended to Dixon by Larry Walker, an agronomist who spent most of his career working as a product development representative for Ciba-Geigy and Syngenta before retiring and becoming a crop consultant in his hometown of Flintville, Tenn. Larry Walker, left, and Steve Dixon are shown in one of Dixon’s fields on his farm in Franklin County in middle Tennessee. But we couldn’t find a live pigweed in that area when we checked it a few days later.” “When we came back and sprayed, I told him maybe the postemergence herbicide mixture would at least suppress them. “My son, Andrew, spotted the pigweed when he was side dressing that field – the corn was knee high and so was the pigweed,” said Dixon. “When we sprayed our corn with our postemergence material, one field didn’t get sprayed when we meant to. “We had a lot of pigweeds in our soybeans last year, and we decided to try a different pre-emergence herbicide approach when we rotated to corn this spring,” he said. That’s what happened to Steve Dixon on his farm in Franklin County, Tenn.
Inevitably, fields get sprayed out of order, and, when they do, it can create worry for the grower. Synergized Ametryn could be old/new tool for resistant weeds.įarmers cover a lot of ground in the spring.
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