Dicamba Cut-Off Date Reminder
Mike Hunter: CCE-North Country Regional Ag Team, https://blogs.cornell.edu/ccef...
June 30, 2022 marks the official cutoff date for the over the top use of XtendiMax, Engenia and Tavium on Xtend or XtendFlex traited soybean in New York. Now the question that will be asked by growers is "I've planted Xtend soybeans; now what are my options?".
For soybean growers that have resistant tall waterhemp and palmer amaranth in soybeans there are other effective herbicide options available. The postemergence control of resistant tall waterhemp and palmer amaranth in all soybeans, including conventional, can be achieved by applying Reflex or Flexstar (fomesafen) or Prefix (s-metolachlor + fomesafen) or Warrant Ultra (acetochlor + fomesafen) before the weeds reach 3 inches tall. If necessary, a late rescue treatment of Cobra (lactofen) can be applied.
Unfortunately, for soybean growers that have multiple resistant marestail (Groups 2 and 9) in Xtend soybeans there no other effective postemergence herbicides to control this problematic weed without using one of dicamba herbicides. Postemergence applications of Reflex, Flexstar and Cobra, will not control marestail (see figs. 1 & 2).
For growers that planted XtendFlex soybean, Liberty (glufosinate) herbicide will provide an additional option for the postemergence control of marestail under 6 inches tall. Once marestail is over 6 inches tall it becomes increasingly difficult to control. For best results, apply 32 to 43 ounces of Liberty plus 3 pounds spray grade ammonium sulfate per acre using 20 gallons water as a spray carrier to ensure adequate coverage. Hot, sunny, humid days provide ideal conditions for the application of Liberty herbicide. Consider making applications between dawn and two hours before sunset for improved control of some tougher to control weeds such as marestail. Liberty herbicide can be applied up to R1 or beginning bloom stage in soybeans.
Always read and follow label directions prior to using any herbicide. If you have any additional questions about late season soybean weed control, contact your local Cornell Cooperative Extension office.
Upcoming Events
WEBINAR - Automated Milking Systems Efficiency: Balancing Focus on Individual Cows and System Optimization
May 8, 2024
Please join Cornell the SWNY team and MSU Extension for our talk with Dr. Pablo Silva BoloƱa on improving efficiency of Automated milking systems by focusing on milking settings for individual and group success.
Broiler Field Day at Sunny Cove Farm
June 6, 2024
Alfred Station, NY
Join us for a field day to explore broiler production, processing, and finances. Meghan Snyder of Sunny Cove Farm will be our host. She raises small batches of organic broilers, processing them on-farm under the 1,000 bird exemption.
Cornell Seed Growers Field Day
July 2, 2024
Ithaca, NY
Please Save the Date for the Cornell Seed Growers Field Day to be held the morning of July 2nd. The event will be held at the NYSIP Foundation Seed Barn, 791 Dryden Rd., Rt. 366, Ithaca, NY.
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