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^: *https://www.cambridge.org/core/journals/weed-technology/all-is sues (https://www.cambridge.org/core/journals/weed-technology/all-iss ues)
^: Stephenson D.O.; Spivey T.A.; Deliberto M.A.; Blouin D.C.; Woolam B.C.; Buck T.B.
^: Effects of Low-Dose Flumioxazin and Metribuzin Postemergence Applications on Soybean [ . ()]
^: Weed Technology, 2019; Vol.33,N 1. - P. 87-94
^: 2019
^: Bibliogr.:p.93-94
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^: . " " 2021'1 .124

aref2 All herbicides will move off-target to sensitive crops when not applied correctly. Therefore, low-dose applications of flumioxazin and metribuzin were evaluated in soybean at the unifoliate, V2, and V4 growth stages. Rates evaluated were 12.5%, 25%, and 50% of the labeled use rates of 72 and 316 g ai ha&#8722;1 of flumioxazin and metribuzin, respectively. Flumioxazin injury was characterized by necrosis and visible height and width reduction. Injury increased with rate 3 d after treatment (DAT), with unifoliate, V2, and V4 soybean injured 15% to 30%, 18% to 27%, and 5% to 8%, respectively. Unifoliate and V4 soybean were injured more than V4 soybean 3 to 14 DAT, but injury decreased to <5% by 42 DAT. Soybean yields in the flumioxazin study were 92% to 96% of the nontreated, resulting in a yield loss of 196 to 393 kg ha&#8722;1 and a revenue loss of 71 to 141 US$ ha&#8722;1. Metribuzin injury was primarily chlorosis with necrosis and a visible reduction in soybean height and width. Soybean at the V2 growth stage was injured 14% more than V4 soybean 3 DAT, regardless of metribuzin rate. Injury to V2 and V4 soybean was similar 14 DAT, with injury of 21% to 40% across rates. Soybean injury when treated at the V2 and V4 growth stages was 6% to 29% 42 DAT compared to unifoliate soybean at 0 to 17%. Soybean yields in the metribuzin study yields were 96% to 98% of the nontreated. However, a 2% to 4% reduction equates to a loss of 90 to 180 kg ha&#8722;1 and a revenue loss of 32 to 65 US$ ha&#8722;1. Unifoliate and V2 soybean are more sensitive to a low dose of flumioxazin POST, and V2 and V4 soybean are more sensitive to a low dose of metribuzin POST. Injury and the impact on soybean growth could potentially cause economic loss for a soybean producer.

^TRN: 1914266
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