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Ohio State University Extension

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Soybean Weeds

C.O.R.N. Newsletter Articles

  1. Weed Management in Dry Conditions

    Author(s): Alyssa Essman

    This article is written with the hopes that relaying some information about management in a dry pattern will bring on some rain. If that doesn’t work, below are some reminders and considerations for weed control in dry conditions.

    Issue: 2023-17

  2. Giant Ragweed Still Looms Large

    Author(s): Alyssa Essman

    Each fall just before harvest, the OSU weed science program conducts a statewide driving survey evaluating the frequency and distribution of problematic weed species in Ohio. Diagonal transects are driven through the top 45-50 soybean producing counties. Visual ratings are given for ten weed species in each soybean field encountered. The weeds evaluated during this survey were: marestail, giant ragweed, common ragweed, waterhemp, Palmer amaranth, redroot pigweed, volunteer corn, common lambsquarters, grasses/foxtail spp., and velvetleaf.

    Issue: 2022-41
  3. Marestail (Horseweed)

    Controlling Marestail in Double-Crop Soybeans

    A uniform wheat crop can provide effective suppression of marestail, especially when combined with some in-crop herbicides.  It is nonetheless typical for marestail plants to be evident after the wheat is harvested, and these should be controlled prior to double crop soybean emergence.  There can be a couple types of marestail plants to deal with in this situation:  1) small ones that were lurking near the base of the wheat plants, which are largely not disturbed by the combine; and 2) larger ones that may have been present in areas of thin wheat stand, which get cut off by the combine and

    Issue: 2018-21

  4. Deciphering preplant dicamba labels and tank mixtures

    Dicamba can have a good fit in spring preplant burndown programs, especially for control of overwintered marestail in fields not treated the previous fall. We typically recommend a preplant burndown that includes at least two herbicides with substantial activity on marestail in this situation, such as Sharpen + 2,4-D or Gramoxone + 2,4-D + metribuzin. Dicamba is the most effective burndown herbicide on glyphosate-resistant marestail in the spring though, and in our research has usually killed or at least stopped emerged marestail in their tracks without help from other herbicides.

    Issue: 2018-05

  5. Are Fall Herbicide Treatments Necessary in Xtend Soybeans?

    There is obviously a lot going on with the dicamba issue, resulting in uncertainty as to where exactly we are headed with regard to future labels, restrictions, and stewardship.  However, we are fairly confident that the label for early-season use of dicamba in preplant/premeergence burndown programs will be preserved into next year at least  (“dicamba” in this article refers to the three dicamba products approved for use in Xtend soybeans – Engenia, XtendiMax and FeXapan).  Dicamba is more effective than 2,4-D on marestail in the spring, and has a good fit in burndown programs to help with

    Issue: 2017-31
More Newsletter Articles

Publications

  1. Ohio, Indiana and Illinois Weed Control Guide, Bulletin 789
    12/2020

    Ohio, Indiana and Illinois Weed Control Guide, Bulletin 789. Publication gives detailed guidance on weed control selections. Numerous tables by crop and application help producers select the best product option for their weed control situation. Hard copy and PDF available for purchase

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