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Investigations of the Potential Interactions Between Pre-emergence Residual Herbicides, Variety, and Seed Treatments in Soybean

Published online by Cambridge University Press:  24 September 2018

Blake R. Barlow
Affiliation:
Former Graduate Research Assistant, Division of Plant Sciences, University of Missouri, Columbia, MO, USA
Lovreet S. Shergill*
Affiliation:
Postdoctoral Fellow, Division of Plant Sciences, University of Missouri, Columbia, MO, USA
Mandy D. Bish
Affiliation:
Senior Research Specialist, Division of Plant Sciences, University of Missouri, Columbia, MO, USA
Kevin W. Bradley
Affiliation:
Professor, Division of Plant Sciences, University of Missouri, Columbia, MO, USA
*
Author for correspondence: Lovreet S. Shergill, Division of Plant Sciences, University of Missouri, Columbia, MO 65211. (Email: shergilll@missouri.edu)

Abstract

Field experiments were performed in 2016 and 2017 in Missouri to determine whether interactions exist between PRE herbicides and seed treatments in soybean. The experiments consisted of a randomized complete block design with factorial arrangements of varieties, seed treatments, and herbicides. We selected two genetically similar varieties of soybean, one with known tolerance to PPO-inhibiting herbicides and one with known sensitivity. Each variety of seed received three separate seed treatment mixtures (STMs): (1) STM1, imidacloprid plus prothioconazol+penflufen+metalaxyl plus metalaxyl plus Bacillus subtilis+B. pumilis, (2) STM2, Pasteuria nishizawae plus thiamethoxam plus prothioconazol+penflufen+metalaxyl plus metalaxyl plus B. subtilis+B. pumilis, and (3) STM3, fluopyram plus imidacloprid plus prothioconazol+penflufen+metalaxyl plus metalaxyl plus B. subtilis+B. pumilis. Chlorimuron-ethyl+flumioxazin+pyroxasulfone, chlorimuron-ethyl+flumioxazin+metribuzin, and chlorimuron-ethyl+sulfentrazone were applied PRE to each variety and seed treatment combination at 1× and 2× the labeled use rate. Chlorimuron-ethyl+sulfentrazone treatment at the 2× rate resulted in greater injury of 8% and 14% to the sensitive variety than the tolerant in 2016 and 2017, respectively; this was the highest injury observed from any herbicide treatment in either year. In 2017, chlorimuron-ethyl+sulfentrazone resulted in the greatest height reductions in both varieties, but this reduction was more evident in the sensitive (19%) than in the tolerant (6%) variety. Overall, yield differences between the two varieties were not consistent between years, and for both varieties, the sulfentrazone-containing treatments resulted in the highest yield losses. The results of this research indicate that there is a larger interaction between herbicides and varieties than there is between herbicides and seed treatments, or seed treatments and varieties.

Type
Research Article
Copyright
© Weed Science Society of America, 2018 

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