Mesotrione carryover into soybean examined
click image to zoomGlenn NiceFigure 2. Bleaching and strapping effect in soybean leaves. In most cases soybean appear to grow out of this and yield is not greatly impacted. I could not find any reports indicating yield was impacted by mesotrione carryover. In the cases reported in 2004 no yield effects were reported.
In a study conducted by Bryan Young at the Southern Illinois University, mesotrione was applied over the top of soybean . A 7 oz/A application of Callisto provides 0.2 lb ai/A of mesotrione. In the above study mesotirone was put out at 0.5, 1.5, 5, 15 and 45% of the 0.2 lb ai/A rate. All rates were reported to cause injury. Injury reported were “bleaching, necrosis, and malformation.” Suggesting that the strapping symptomology mentioned above is not completely unsubstantiated. The 15 and 45% rates induced 31 to 66% injury respectively, 28 days after treatment. At 56 days after treatment injury was 6% or less from all rates except the highest. At the lower rates soybean was able to bounce back having no yield impacts when compared to a non treated check. The two highest rates with 31 and 66% injury at 28 days after treatment were also reported to decrease yield 11 and 22% respectively.
Mesotrione and other HPPD inhibitors are valuable tools for weed management in corn. Callisto’s rotation restriction for planting soybean is 10 months and for the most part this is sufficient to assure that the herbicide has broken down enough to have no impact on the following years soybean. Oddly enough, nature and human error has a way of providing eloquent scenarios that can lead to products that typically do the job they were intended for with no implications to bite us a bit.
1. Herbicide Update. 2004. Bill Johnson, Glenn Nice and Tom Bauman. Purdue University www.btny.purdue.edu/weedscience/2004/articles/update04.pdf
2. Mesotrione Carryover to Soybean. 2004. Mike Owen. Iowa State University. http://www.ipm.iastate.edu/ipm/icm/2004/7-12-2004/mesotrione.html.
3. Soybean (Glycine max) Response to Foliar Applications of Mesotrione. 2003. Bryan G. Young, Julie M. Young, Joseph L. Matthews. Weed Technology, Vol. 17, No. 4 pp. 651-654
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