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Play offense on herbicide resistant marestail in soybeans

Play offense on herbicide resistant marestail in soybeans
Take marestail on and get control of this weed early in the season.

Purdue's Bill Johnson and Mark Loux, Ohio State University Extension weed control specialist, have prepared recommendations for marestail control in soybeans. Here are key highlights from their recommendations.

Related: Don't neglect marestail, giant ragweed and waterhemp to tackle Palmer amaranth

• Best spring control of emerged maretail is in rosette stage. Fall-emerged plants bolt quicker in the spring.

• Tillage is effective if you thoroughly mix the upper few inches and uproot existing plants

Hard to knock down: Here is what happens when marestail plants are too big when sprayed with post-emergence herbicides. (Photo courtesy Bill Johnson, Purdue University Extension)

• Never plant into existing marestail. Burndown options include 2,4-D ester plus glyphosate; a Saflufenacil product, like Sharpen or Verdict, plus an MSO plus glyphosate or Liberty; 2,4-D ester plus glyphosate plus Sharpen or Verdict plus MSO; 2,4-D ester plus Gramoxone plus metribuzin; or Liberty with Cheetah, where metribuzin improves control.

• Liberty over Liberty Link soybeans is the most effective marestail control strategy. Apply Liberty/Cheetah at 29 ounces per acre before plants exceed 6 inches tall. You can go to 36 ounces on taller plants, but control is variable.

• Glyphosate and 2,4-D ester alone isn't consistent. Add metribuzin and/or Sharpen, or one of the burndowns above.

• Improve control by applying the highest rate of 2,4-D allowed. Check label for restrictions on interval between application and planting

• Adding dicamba to spring burndowns delivers better control than 2,4-D, but is more damaging to soybeans if you don't follow guidelines. Clarity label specifies a 14- to- 28 day interval, depending upon rate and rainfall.

• Include residual control with burndown. Residual options include: flumioxazin (Valor, Valor XLT, Envive/Enlite, Fierce, Fierce XLT, Gangster/Surveil. Trivence; sulfentrazone (Authority First, Sonic, Authority XL/MAXX, Authority, Authority Assist; metribuzin: Metri DF, Tricor, Glory, rate based on soil type; addition of metribuzin to products already containing metribuxin, such as Boundary/Ledger, Canopy/Cloak DF, Intimidator, Matador and Authority MTZ.

• If marestail is ALS-resistant maximize use of flumioxazin, sulfentrazone or metribuzin. Consider mixtures with two non-ALS products.

Related: Thoughts About Controlling Marestail

Learn more in the 2015 Weed Control Guide for Ohio. Order at 614-292-1607.

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