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: Corn
Application type: Postemergence
Atrazine is a restricted-use pesticide. Shotgun is a premix containing 2,4-D iso-octyl ester and atrazine for postemergence control of annual broadleaf weeds. Apply over-the-top to corn from spike stage to 8 inches tall. For corn growing on coarse-textured soils, limit the rate to 2 pt. For corn 8 to 12 inches tall, apply with drop nozzles. A reduced rate of Shotgun can be tank mixed with bromoxynil or dicamba to enhance kochia control, including triazine-resistant kochia. Note weed size limitations. Do not apply aerially. Do not use with liquid fertilizer. Addition of adjuvants is not recommended because of enhanced potential for crop injury. Shotgun application is considered an atrazine best management practice for use in sensitive watersheds because the low rate of atrazine reduces the potential for runoff loss. Follow label directions.