Metribuzin: An Essential Component of Most Soybean Weed Control Programs - In the Weeds

In this episode of "In the Weeds," Dr. Jason Norsworthy discusses Palmer amaranth, the most troublesome weed of soybean in the Midsouth, which has confirmed resistance to at least six herbicide sites of action. There are no known populations with resistance to metribuzin. Weed control programs that begin with metribuzin plus another residual herbicide at planting consistently provide a higher level of early-season control than programs that involve a single herbicide at planting, especially on herbicide-resistant populations. Some commercial metribuzin mixtures labeled for soybean include Boundary (S-metolachlor + metribuzin), Fierce MTZ (flumioxazin + pyroxasulfone + metribuzin), Tripzin (pendimethalin + metribuzin), Moccasin MTZ (S-metolachlor + metribuzin), Trivence (flumioxazin + chlorimuron + metribuzin), Authority MTZ (sulfentrazone + metribuzin), and others. To minimize the risk for soybean injury from metribuzin, only apply to soils with a pH of 7.0 or less, match the rate with the soil texture according to the label, and choose a metribuzin-tolerant variety. There are tolerant varieties for all weed control technologies including Enlist, LLGT27, LibertyLink, Xtend, and XtendFlex. Tolerance ratings for varieties included in the 2019 Arkansas Official Variety test (OVT) are available at https://www.uaex.edu/farm-ranch/crops.... Tolerance of varieties included in the 2020 Arkansas OVT should be available on-line in December or January.

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