Kochia Control in Next Year’s Corn and Sorghum Fields

As we are working through fall harvest, be thinking about weed control in next year’s corn and sorghum fields.  This is because we need to plan now to have good kochia control next spring. 
Late fall herbicide applications are very effective in preventing kochia emergence next spring.  And in the case with kochia control, an ounce of prevention is worth a pound of cure.  Preventing kochia emergence is a big part of the battle with controlling herbicide resistant kochia. 
There are several herbicide options for fall applications for kochia control. A common component of several of the tank mixes is atrazine. If residual weed control is desired, atrazine is among the lowest-priced herbicides to provide this. However, if atrazine is used, that will lock the grower into planting corn or sorghum the following spring, or leave the land fallow during the summer and come back to winter wheat in the fall.  If atrazine is applied too early, warm weather and moisture will reduce the length of residual. November is often the best time for atrazine applications.
Atrazine is labeled in Kansas for fall application over wheat stubble or after row crop harvest any time before December 31, as long as the ground isn’t frozen. Consult the atrazine label to comply with maximum rate limits and precautionary statements when applying near wells or surface water. No more than 2.5 lbs per acre of atrazine can be applied in a calendar year on cropland.
There have been several herbicide tank mixes tested at the K-State Research and Extension Center in Tribune, by weed scientist Curtis Thompson. He looked at not only the initial control of kochia, but how long the control lasted through the growing season. 
Here is the list of tank mixes that were tested in 2014-2015: Atrazine (1 lb), Clarity + Atrazine (1 pt+0.75 lb), Atrazine+Sharpen (0.75 lb+2oz), Clarity+Atrazine+Sharpen (1 pt+0.75 lb+2 oz), Scoparia+Atrazine (2 oz+1lb), Corvus+Atrazine (4 oz+1 lb), Clarity+Atrazine+Zidua (1pt+0.75lb+2.5oz), Authority MTZ (12 oz).  All of these treatments provided near 100% control on March 26.  By April 9, all treatments provided greater than 85% kochia control.  And there was greater than 80% control for all treatments by May 28.  Weed control dropped off from May 28 to June 25, with around 50% control at this later date in the growing season.  Of course, moisture is a key component of activating these herbicides and getting satisfactory weed control. 
Charts showing kochia control from these tank mixes are posted on the K-State Sunflower District Agronomy website at www.sunflower.ksu.edu/agronomy.  If you have any questions, please let me know!  You can also see what I am finding in the field on facebook at K-State Sunflower District Agronomy and on twitter @CropsWithJeanne.


Crop Rotations with Limited Irrigation

A limited irrigation study involving four cropping systems and evaluating four crop rotations was inititated at the K-State Southwest Research-Extension Center near Tribune, KS in 2012.  The study evaluated four difference crop rotations with a limited irrigation allocation. ... [More]

K-State Services for Financial, Legal and Family Dynamic Challenges

With the challenging economic times, issues can rise on the financial, legal or family dynamic front.  Did you know K-State has services that may be able to help with these?  Kansas Agricultural Mediation Services (KAMS) provide agriculture producers resources needed... [More]

More Agtalk


    Sharon Springs News Around Town

    Those enjoying Thanksgiving dinner at the Senior Center on Thursday Nov, 23, 2017 were: Jon Herl; Kent Huffman; Ja’asia Stafford; Joan Harrison; Milton and Carol Tokoi: Jyma Stafford; Bobby Akers; Jo Hunter; Pat Neff; Francees Hickman; Randy and Low Ann; Gebhards; Debbie... [More]

    Wallace County Winter Extravaganza

    On Saturday, December 2, 2017 the Wallace County Chamber of Commerce will be hosting the annual kick-off to the Christmas Holidays. Many events are planned for Saturday starting with the Flea Market at 8:00 am to 1:00 pm being held at... [More]

    Schurr wins essay competition

      Haylee Schurr, formerly of Sharon Springs, won first place in the Goodland VFW Post essay contest for her essay “America’s Gifts for my Generation.” Haylee’s English teacher, Mrs. Artzer, encourages her students to write and given the opportunity,... [More]

    Man Sentenced to Prison

    Wallace County District Court, Wednesday, November 15 - Luis Carlos Lechuga was sentenced to 72 months in prison after pleading “no contest” to charges of indecent aggravated liberties with a child. Lechuga has been incarcerated in the Wallace County jail since being... [More]

    Christmas the Cowboy Way

    For forty years, Riders In The Sky have been keepers of the flame passed on by the Sons of the Pioneers, Gene Autry and Roy Rogers, reviving and revitalizing Western music. And while remaining true to the integrity of the genre, they have themselves become modern-day icons by... [More]

    Navigating the Confusing World of Medicare and Retirement

    Greeley County Health Services is hosting a special community education seminar entitled, Navigating the Confusing World of Medicare and Retirement for Greeley and Wallace County residents on Tuesday, Dec. 6th at 5:30pm at the Senior Center in Tribune.   The... [More]

    Break-in at local business

    Controlled substances were stolen from Dixon Drug in Sharon Springs early Saturday morning.  Wallace County Sheriff Larry Townsend stated the incident occurred at approximately 6:00 am. He said a male individual breached locks and was in and out in less than two minutes.... [More]

    More News


    Bugle Notes....News from the Fort Wallace Museum

    Are you ready to ring in the Christmas Season? Come join us in Wallace this Sunday at 5 pm MST for a special Candlelight Christmas service at the 1888 Bethany Lutheran Church! The traditional service with Swedish influence will be joined with the sounds of the men’s ac... [More]

    Bugle Notes....News from the Fort Wallace Museum

    One ongoing project undertaken this fall by the Fort Wallace Memorial Association is planning for a new home for the Rhea Pump Organ Collection. These 55-plus pump and reed organs were donated to the Fort Wallace Museum, but are currently in storage until a permanent home can... [More]

    Bugle Notes....News from the Fort Wallace Museum

    Even though the peak travel season is behind us, we are still having several visitors a day into the Museum! And there are several events planned for this winter! Make plans to join us at the Museum for a very special Christmas observance and party on Sunday, December 10 at... [More]

    Bugle Notes....News from the Fort Wallace Museum

    We here at the Fort Wallace Museum enjoyed a weekend of learning more about antique weaponry, as well as some delicious food and fellowship! Although noted expert Greg Higginbotham was unable to make the drive from Independence, Missouri, due to serious illness, the “show... [More]

    Bugle Notes....News from the Fort Wallace Museum

    Are you all "fired up" for the fundraising event this Sunday? The "Hands-On History" shooting event will begin promptly at 3 PM MT on the north grounds of the Fort Wallace Museum; come for your chance to handle 19th century firearms, including Henry carbines, trapdoor rifles... [More]

    More Bugle Notes