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
Fierce is a premix containing flumioxazin (Valor) and pyroxasulfone (Zidua) for partial burndown and residual control of grass and broadleaf weeds. Can be applied in the fall, preplant, or preemergence to soybeans, but the best in-crop residual control of summer annual weeds will occur with application close to planting time. Apply with COC and tank mix with glyphosate or other herbicides for enhanced burndown control in no-till. Do not apply in conjunction with products containing dimethenamid or metolachlor or severe soybean injury may occur. Do not plant field corn for 7 to 30 days; wheat or cotton for 1 to 2 months; sunflower for 4 months; alfalfa for 10 months; oats or barley for 11 to 12 months; or any other crops for 18 months after Fierce application.