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: Preplant or Preemergence
These herbicides are restricted-use pesticides. These formulations are used by growers who want to reduce rates of soil-applied atrazine. Formulations vary in their ratio of acetochlor to atrazine, so follow label directions.
Harness Max may be applied to all field corn, grain, silage, or seed, and yellow popcorn early postemergence to corn up to 11 inches tall and before weeds exceed 3 inches tall. Use Harness Max at 40 to 55 fl oz on coarse soils, 55 to 64 fl oz on medium soils, and 55 to 65 fl oz on fine soils when organic matter is less than 3% and 64 to 75 fl oz when organic matter is 3% or greater. Include with these rates, NIS 0.25% v/v or COC at 1% v/v and a nitrogen based adjuvant, UAN or AMS. Do not use COC or nitrogen based products when applying to yellow popcorn. Do not mix with MSO. Harness Max may be applied postemergence when tank mixed with Roundup brand only glyphosate on Roundup Ready 2 technology or Liberty herbicide on Liberty Link corn. Do not use MSO, COC, or a nitrogen based adjuvant when tank mixing with Liberty. Rotational restrictions: sorghum (concept treated immediately) wheat 4 months; alfalfa, soybean, and cotton 10 months; barley, oat, millet, and rye the spring following application; Cucurbits, drybeans, peas, and other crops 18 months. A maximum of 95 fl oz of Harness Max may be used during the season.
TopNotch Herbicide and Degree Herbicide are microencapsulated formulations of acetochlor. Soil activity controls most annual grass and small-seeded broadleaf weeds. Rate depends on soil type and preplant or preemergence timing. Apply and incorporate into top 2 inches of soil within 2 weeks of planting, or apply after planting but before corn emerges. Contains a safener for corn. Do not apply through irrigation system. Do not apply aerially. Do not rotate to crops other than corn, sorghum, wheat, or soybean for 12 months. Can be tank mixed with atrazine, Hornet WDG Broadleaf Blend Herbicide, dicamba, and several other herbicides to enlarge spectrum of weeds controlled. Note restrictions on label for depth to groundwater. Follow label directions.