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: Alfalfa
Application type: Postemergence
Controls annual and perennial grasses. Always apply with COC. Can be applied to seedling or established alfalfa at least 7 days before grazing, feeding, or cutting undried forage or 14 days before cutting for hay. Apply to annual grasses 3 to 8 inches tall and actively growing. Poast is most effective on grasses before they have been mowed. Use higher application rates, and allow active regrowth before treating grasses that have been mowed. Higher application rates are recommended in western Kansas than in eastern Kansas.