Chemical selector

Crop type: Wheat
Application type: Postemergence

Pounds of active ingredient per acre
Propoxycarbazone 0.026 to 0.039
Product quantity per acre
0.6 to 0.9 oz Olympus
Comments and limitations

Controls cheatgrass and certain broadleaf weeds. Apply to small, actively growing weeds after wheat emergence but before the jointing stage of growth. Applications before wheat tiller initiation have a greater risk of stunting the crop. Cheat and Japanese brome are more susceptible than downy brome and generally are controlled adequately in both fall and spring with the 0.6 oz rate. Fall applications at 0.9 oz are recommended for downy brome control. Apply with NIS at 0.25 to 0.5% v/v. Liquid nitrogen fertilizer solutions should not exceed 50% liquid nitrogen and no more than 30 lb of actual nitrogen per acre. Only add 0.25% v/v surfactant when applied with fertilizer carrier. Can be tank mixed with 2,4-D, Ally, Amber, Finesse, Harmony Extra, MCPA, dicamba, Starane, or Rave. STS soybean can be planted 4 months after Olympus treatment. Cotton, grain sorghum, sunflower, and non-STS soybean can be planted 12 months after Olympus treatment if cumulative precipitation exceeds 24 inches. Corn can be planted 18 months after Olympus application if cumulative precipitation exceeds 30 inches. Rotation to other crops with shorter interval requires successful completion of a field bioassay, and no sooner than 4 months after Olympus application.

Product links (each will open in a new tab)
Olympus® 70% Water Dispersible Granular Herbicide: Product label, Safety data sheet

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.

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