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.
Click here for a How-to Tutorial.
Crop type: Soybean
Application type: Preplant or Preemergence
Authority XL is a premix containing 62% sulfentrazone and 7.8% chlorimuron. Can be applied preplant in the fall or spring or preemergence until 3 days after planting for residual broadleaf control and some grass suppression. The low rates are recommended primarily as a foundation treatment ahead of a broad-spectrum postemergence treatment in herbicide-resistant soybean. Higher rates are recommended for use on conventional soybean or where herbicide-resistant weeds are present. Do not use on soils with greater than 7.6 pH. If soil sH is less than 7.2, or low rates are used, do not rotate to wheat for 4 months; sorghum or corn for 10 months; oats or alfalfa for 12 months; cotton or sunflower for 18 months; or canola for 36 months after application. If soil pH is 7.2 to 7.6 and higher rates are used, do not rotate to wheat for 4 months; sorghum, corn, oats, alfalfa, cotton, or sunflower for 18 months; or canola for 36 months after application.