Saturday Apr 14, 2018 at 4:06 PM
Difficult weeds, abnormally glyphosate-resistant weeds, are controlled best consistently with soil-applied herbicides, which annihilate alpha seeds/seedlings. Much of the attrition to glyphosate has developed from over-reliance on post-emergence herbicide applications for edger control. Thus it is capital to accommodate one or added of the pre-plant and pre-emergence balance herbicides accessible for summer row crops. The specific herbicide you use, although important, is usually beneath important than aloof authoritative the accommodation to use a pre-plant or pre-emergence herbicide.
It is important to use assorted modes of activity back selecting herbicides. To abetment growers, the Edger Science Society of America has developed a numbered allocation arrangement based on the herbicide armpit of activity to abetment farmers and applicators in selecting herbicides with altered sites of action. For example, the advertence cardinal herbicide approach of activity for glyphosate is No. 9. Best herbicide labels now acutely affectation the herbicide allocation cardinal at the alpha of the label. Herbicide premixes that accommodate assorted alive capacity with altered sites of activity will accept all sites of activity numbers listed.
It is important to change herbicide programs from time to time so that you do not get absorbed on any distinct herbicide affairs year afterwards year. Edger breed about-face and advance attrition to herbicide programs that do not change. It’s additionally important to apperceive the strengths and weaknesses of anniversary artefact in agreement of the spectrum of weeds controlled. A table summarizing edger breed acknowledgment to assorted herbicides specific to anniversary crop, based on aloof analysis acreage assignment by K-State edger scientists can be begin in the 2018 Chemical Edger Ascendancy for Acreage Crops, Pastures, Rangeland, and Noncropland (SRP 1139). For example, all of the herbicides labeled in Kansas for blah and the edger acknowledgment to called herbicides back activated according to characterization admonition can be begin in the table listed on pages 24 to 26.
For burndown applications in a no-till arrangement on emerged grass and broadleaf weeds, an appliance of glyphosate (9) and a artefact absolute dicamba (4) or 2,4-D (4) may be analytical in adjustment to alpha with a edger chargeless seed-bed. The best amid 2,4-D and dicamba will depend on edger breed present. Dicamba articles will be added able on kochia and marestail. 2,4-D is added able on winter anniversary mustards. The use of pre-emergence herbicides, activated aloof afore or afterward burying generally provides ascendancy of weeds for several weeks. This can abundantly advance the capability of a post-emergence herbicide appliance and gives the ambassador added elbowroom on column appliance timing.
There are too abounding pre-emerge or soil-applied balance herbicides for summer row crops to detail in this article. The take-home bulletin is that in adjustment to achieve acceptable edger ascendancy whether you accept herbicide aggressive weeds or not is to abstain year-after-year use of herbicides that accept the aforementioned armpit of action. It is capital to accommodate one or added of the pre-plant and pre-emergence balance herbicides on top of a acceptable bake bottomward analysis with added than aloof glyphosate. Ideally it is recommended to alpha with a apple-pie edger chargeless seed-bed, or at the actual atomic weeds that accept been sprayed either aloof afore or anon afterwards planting.
Stacy Campbell is a Kansas State Analysis and Extension abettor in Hays for the Cottonwood Extension District Office.
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