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
Controls annual broadleaf weeds. Apply to small, actively growing weeds through the 3 trifoliate-leaf stage of soybean. Apply with surfactant. Wheat or barley can be planted after 3 months and corn or sorghum after 9 months, except where Classic is applied after Canopy (15 months). Can be tank mixed with 2,4-DB to increase morningglory control or with glyphosate (Roundup Ready soybean only) for broad-spectrum weed control. Some pigweed species, such as waterhemp and Palmer amaranth, have developed resistance to Classic and other herbicides having the same mode of action. Management strategies such as alternative control methods, crop rotation, and using herbicides with a different mode of action to replace or supplement Classic in a tank mix need to be considered in areas that may have resistant weed biotypes. Do not allow grazing or harvest for forage.