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Kansas State University

Thelatest edition of ChemicalWeed Control for Field Crops, Pastures, Rangeland, and Noncropland isnow available at county Extension offices andonline at: http://www.ksre.ksu.edu/bookstore/pubs/SRP1099.pdf

Much haschanged in the magnitude of the weed control guide over the years, but thepurpose remains the same.

In 1967 itconsisted of 12 pages, with large print and a lot of white space. The currentguide is about 135 pages with very condensed print and contains much moreherbicide information. It has always been intended to be a resource to helpfarmers and crop advisors with selecting herbicides and using themappropriately.

The 1967edition listed 16 herbicide active ingredients while the latest edition includes93 active ingredients. In addition to those 93, the guide also includes genericproducts and pre-mix combinations.

Probably thefirst place you would go to for reference would be the efficacy tables. Theyhave the various herbicide treatments and combinations listed by applicationtiming, whether that is a preplant, preemergence, or postemergence herbicide.Then it provides ratings for the kind of weed control we would anticipate onthe common weed species in those crops.

We base theinformation included in the guide on field trial evaluations done by K-Statescientists, evaluations of new and established herbicides for crop toleranceand weed control, and recommendations from chemical professionals and otheragronomists who have performed herbicide testing in other states.

Along withthe efficacy tables is information about safe use and handling, protectiveequipment and herbicide resistance management. There is also a cost tableavailable, which is developed by soliciting information from distributors andadding in a percentage markup for retail. It does not account for discountsthat might be available through local retailers, so growers might end up payingless than the amount projected.

Additionally,there is information about managing pastures and rangeland, land enrolled inthe Conservation Reserve Program, noncropland and noxious weeds as well.

The guide isjust one source for weed control. People should also consult their local cropadvisors on herbicide application, as products might perform differently incertain parts of Kansas.It is also not meant to serve as a replacement to the herbicide label, which isimportant for people to read.

Theherbicide label is the law, and that's the resource you should go to when usingthose herbicides. But, this guide does provide some comparisons, restrictionsand how the various herbicides should be utilized.

It issurprising how many changes have to be made to the guide annually. Therefore,anyone who has an outdated copy should get the 2014 edition.

DallasPeterson, Weed Management Specialist dpeterso@ksu.edu

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