Managing Marestail in No-till Soybeans

ANR-72
Agriculture and Natural Resources
Date: 
06/12/2019
Mark M. Loux, The Ohio State University, and Bill Johnson, Purdue University

Guiding Principles of Marestail Management  

  • Combination of fall and spring burndown herbicides is most effective. Overwintered plants are difficult to control with spring burndown alone. Marestail after flower
  • Marestail plants should be dead or dying prior to crop emergence.
  • Most populations are resistant to both glyphosate and ALS inhibitors (site 2) such as Classic and FirstRate. Populations in some areas are becoming more difficult to control with 2,4-D also.
  • There are no POST options in Roundup Ready or non-GMO soybeans, so in-season control depends solely upon use of effective residual herbicides.
  • For control after crop emergence, combinations of several residual herbicides are more effective than single active ingredients.
  • LibertyLink and Xtend soybeans provide for effective POST options.

Step 1. Fall herbicides

  • Soybeans—2,4-D plus one of the following: glyphosate, dicamba, Basis, Canopy/Cloak, metribuzin
  • Corn—2,4-D plus one of the following: glyphosate, dicamba, Basis, simazine, metribuzin
  • Keep herbicide cost less than $10
  • Avoid use of other residual herbicides; save them for spring

Step 2. Spring burndowns, following fall herbicides

close-up of fall growth
Three growth stages of marestail
  • Glyphosate + one of following: 2,4-D, Elevore + 2,4-D, Sharpen, Zidua PRO
  • Gramoxone (2 to 3 pt) + 2,4-D + metribuzin
  • Glufosinate + metribuzin
  • Can add metribuzin (0.3 to 0.5 lb ai) and/or 2,4-D to most of these
  • Glyphosate + dicamba (Xtend soybeans)
  • Elevore, 2,4-D have plant-back restrictions

Spring burndowns, no fall herbicides

  • Glyphosate + Sharpen/Zidua PRO + 2,4-D + metribuzin
  • Gramoxone  (4 pt) + 2,4-D + metribuzin
  • Glyphosate + dicamba (Xtend soybeans)
  • Glyphosate + dicamba + Sharpen (Xtend soybeans)
  • Glufosinate + Sharpen + metribuzin
  • Metribuzin rates—0.3 to 0.5 pounds per ai

Step 3. Include residual herbicides with spring burndown

  • Flumioxazin—Valor and Fierce products, Surveil, Envive/Enlite, Trivence, Panther Pro, others
  • Sulfentrazone—Authority products, Sonic, others
  • Metribuzin—various products and premixes
    • Equivalent of 0.3 to 0.5 lb ai metribuzin
    • Add more metribuzin as necessary if rate in premix is low
  • Residual herbicide mix should be more complex in Roundup Ready and non-GMO soybeans due to lack of effective POST options (or in Xtend to avoid POST use of dicamba)
    • Panther Pro, Trivence
    • Metribuzin plus one of following: flumioxazin, sulfentrazone, Sharpen (1.5 to 2 oz)

Step 4. Postemergence options

  • Roundup Ready or non-GMO soybeans?no effective POST options
  • LibertyLink soybeans
    • Glufosinate—Liberty, Cheetah, Interline, etc
    • Marestail plants less than 6 inches tall
  • Xtend soybeans
    • XtendiMax, Engenia, FeXapan (plus glyphosate)
    • Apply by early June and prior to R1 stage
    • Risk of off-target movement; see label and other information from manufacturers and universities
  • Enlist soybeans
    • Enlist Duo, Enlist One
    • Glufosinate
    • Most effective: glufosinate + Enlist Duo
Three examples of multiple-resistant marestail and treatments to plots.

Multiple-resistant marestail surviving treatment with (from left to right) glyphosate alone, ALS inhibitor (site 2) alone, and a combination of glyphosate plus ALS inhibitor.

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Revised 10/19