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: Postemergence
A contact herbicide that controls many broadleaf weeds. Apply to small, actively growing weeds before they reach size limits listed on the labels (normally 2 to 3 weeks after planting). Apply with 1 pt/acre COC when soybean is at the first or second trifoliate leaf stage. AMS or liquid nitrogen fertilizer can also be added for enhanced performance. Cobra can cause speckling, discoloration, cupping, or crinkling of leaves. Phoenix generally causes less soybean response than Cobra but also may be slightly less effective on certain weeds. Soybean outgrows these conditions, and new growth develops normally. Cobra can be especially helpful in controlling pigweed species. Palmer amaranth is more difficult to control and may require the high use rate and perhaps sequential applications, especially for larger plants. Do not use treated plants for feed or forage.