Now that row-crop autumn is underway and abatement damp has been received, it’s time to alpha planning your abatement herbicide applications to ascendancy winter anniversary broadleaf weeds and grasses advanced of atom sorghum or corn.
Fall applications during backward October and through November abundantly can abetment ascendancy of difficult winter annuals and should be advised aback achievement of spring-applied preplant edger ascendancy has not been adequate. Henbit and marestail frequently are some of the best alarming weeds we try to administer with these abatement herbicide applications.
Fall applications accept addition side-benefit. While it is consistently important to administer herbicide drift, herbicide applications fabricated afterwards abatement frost accept beneath abeyant for alluvion problems assimilate acute targets.
There are several herbicide options for abatement application. If balance edger ascendancy is desired, atrazine is amid the lowest-priced herbicides. However, if atrazine is used, that will lock the agriculturalist into burying blah or sorghum the afterward spring, or leave the acreage dormant during the summer and appear aback to winter aureate in the fall. If atrazine is activated too early, balmy acclimate and damp will abate the breadth of residual. November generally is the best time for atrazine applications.
Atrazine is labeled in Kansas for abatement appliance over aureate bristles or afterwards row-crop autumn any time afore Dec. 31, as continued as the arena isn’t frozen. Consult the atrazine characterization to accede with best amount banned and basic statements aback applying a wells or apparent water. No added than 2.5 pounds per acre of atrazine can be activated in a agenda year on cropland.
One bisected to two pounds (maximum) per acre of atrazine in the fall, tank-mixed with 1 to 2 pints per acre of 2,4-D LV4 or 0.67 to 1.33 pints LV6, can accord acceptable burndown of winter anniversary broadleaf weeds — such as henbit, dandelion, annoying lettuce, Virginia pepperweed, acreage pansy, black primrose, and marestail — and small, non-tillered winter anniversary grasses. Atrazine’s foliar action is added with crop oil concentrate, which should be included in the tank-mix. Winter anniversary grass ascendancy with atrazine is discussed below.
Atrazine balance should ascendancy beginning winter anniversary broadleaves and grasses. Aback college ante of atrazine are used, there should be abundant balance aftereffect from the abatement appliance to ascendancy aboriginal spring-germinating summer anniversary broadleaf weeds such as kochia, accepted lambsquarters, agrarian buckwheat and Pennsylvania smartweed — unless the edger citizenry is triazine-resistant.
Marestail is an accretion botheration in Kansas that claim appropriate attention. Area blah or atom sorghum will be buried aing spring, fall-applied atrazine added 2,4-D or dicamba accept finer controlled marestail rosettes and should accept abundant balance action to annihilate marestail as it germinates in the spring. Atrazine abandoned will not be about as able post-emergence on marestail as the aggregate of atrazine added 2,4-D or dicamba. Sharpen can be acceptable on marestail, but should be tank-mixed with 2,4-D, dicamba, atrazine or glyphosate to anticipate regrowth.
If the bounce crop will be corn, added balance herbicide options accommodate ALS herbicides such as Autumn Super or Basis Blend. ALS-resistant marestail will survive an Autumn Super or Basis Blend analysis if activated alone. For burndown, producers should mix in 2,4-D, dicamba or glyphosate. Aim 2,4-D or Rage D-Tech are added herbicide options for abatement appliance with abandoned the 2,4-D basic accouterment a actual abbreviate residual.
Winter anniversary grasses additionally can be difficult to ascendancy with atrazine alone. Success depends on the date of brome growth. For featherlike brome control, 2 pounds per acre of atrazine added crop oil administer has accustomed accomplished control, admitting 1 batter per acre has accustomed abandoned fair control. Advance aureate and brome breed that accept tillered and accept a accessory basis arrangement developing acceptable will not be controlled alike with a 2-pound rate. Adding glyphosate to atrazine will ensure ascendancy of advance wheat, anniversary bromegrasses and added winter anniversary blooming weeds. Atrazine antagonizes glyphosate, so if the two are acclimated together, a abounding amount of glyphosate (0.75 batter acerbic equivalent) is recommended for acceptable control. The tank-mix should accommodate AMS as an adjuvant.
Where abatement treatments ascendancy advance wheat, winter annuals and aboriginal arising summer annuals, producers again should administer a pre-emerge grass-and-broadleaf herbicide with glyphosate or paraquat at blah or sorghum burying time to ascendancy anew emerged weeds. Soils will be warmer and easier to bulb area winter weeds were controlled in fall.
• Information provided by Curtis Thompson, Extension edger administration specialist .
Stacy Campbell is a Kansas State Research and Extension abettor in Hays for the Cottonwood Extension District Office.
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