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.
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Crop type: Soybean
Application type: Postemergence
Apply only to Roundup Ready soybean. Application to other soybean will result in severe injury or death of the crop. Flexstar GT 3.5 is a premix of 0.66 lb fomesafen (Flexstar) and 2.63 lb ae glyphosate/gal. Flexstar GT 3.5 provides broad-spectrum control of emerged weeds and residual control of certain broadleaf weeds, including pigweeds. Condition spray solution by adding 1 to 2% AMS (8.5 to 17 lb/100 gal water) before adding Flexstar GT 3.5 to the spray tank. Under adverse growing conditions or if a known population of glyphosate-resistant broadleaf weeds is present, add 1% v/v COC or MSO to the spray solution. Do not apply in counties west of U.S. Highway 281 or to fields previously treated with Prefix herbicide. Do not rotate to wheat for 4 months; corn for 10 months; or alfalfa, canola, grain sorghum, or sunflowers for 18 months after application.
A contact herbicide that controls many broadleaf weeds. Apply to small, actively growing weeds before they reach size limits listed on the labels (normally 2 to 3 weeks after planting). Apply with oil concentrate or NIS plus UAN or AMS. Formesafen can cause temporary leaf speckling and burning, but new soybean growth is unaffected. Do not use in counties west of Highway 281. Do not rotate wheat for 4 months, corn for 10 months, or alfalfa, canola, sorghum or sunflowers within 18 months of application. Do not allow grazing or harvest treated soybean for forage or hay. Do not use if formesafen was applied earlier in the season and use only in alternate years.