Chemical selector
The Pesticide Selector includes suggestions for chemical control of pests in Kansas crops, which are provided by K-State Research and Extension, and may not be relevant for states other than Kansas. We will continue to expand this tool for help in selecting other types of agricultural chemicals, and for other states. Contact the myFields Team if you are interested in contributing content!
The herbicide performance ratings are taken from: C.R. Thompson, D.E. Peterson, W.H. Fink, P.W. Stahlman, and J.W. Slocombe. 2020. Chemical Weed Control for Field Crops, Pastures, Rangeland, and Noncropland, Kansas State University, January 2016. Contribution no. 16-029-S from the Kansas Agricultural Experiment Station. Find it online at the bookstore.
The insecticide recommendations are taken from: B.P. McCornack, S. Zukoff, R.J. Whitworth, J.P. Michaud, and H.N. Schwarting. 2019. Insect Management Guides. March 2018. Kansas State University Agricultural Experiment Station and Cooperative Extension Service. PDF formats are available here.
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Crop type: Soybean
Application type: Preplant or Preemergence
Authority First and Sonic are premixes of 7.9% cloransulam and 62.1% sulfentrazone. Can be applied preplant or preemergence until 3 days after planting. Primarily controls yellow nutsedge and broadleaf weeds, including waterhemp, Palmer amaranth, morningglory, velvetleaf, and black nightshade. The low rates are recommended primarily as a foundation treatment ahead of glyphosate in glyphosate-resistant soybean unless glyphosate-resistant weeds are present. Higher rates are recommended for use on conventional soybean varieties or where glyphosate-resistant weeds are present. Do not use on sandy soils with less than 1 % organic matter. Do not rotate to wheat for 4 months, corn for 10 months, alfalfa or sorghum for 12 months, cotton for 12 to 18 months, canola for 24 months, or sunflower for 30 months after application.