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 to Crop and Preemergence to Weeds
For preemergence control of certain annual grass and broadleaf weeds in seedling or established alfalfa for forage or hay. Apply 1.1 to 2.1 pt/acre to seedling alfalfa between the 2 trifoliate-leaf and 6-inch stages of growth. Apply 2.2 to 8.4 pt/acre to established alfalfa from the last cutting in fall until alfalfa has 6 inches of spring regrowth. Do not harvest alfalfa less than 50 days after applying more than 4.2 pt/acre. Can be applied between cuttings at rates up to 4.2 pt/acre with a 28-day preharvest interval. Some stunting and chlorosis of alfalfa may occur with postemergence applications. Do not exceed a cumulative total of 8.4 pt/acre in a single cropping season.