Corn Weeds

C.O.R.N. Newsletter Articles

  1. Palmer amaranth seedhead
    Author(s): Mark Loux

    Palmer amaranth has shown up in a few more places in Ohio this summer at a range of infestation levels, and waterhemp has also become more prevalent. Newly discovered Palmer infestations in some fields were too high to be remediated by walking fields and removing plants, although there is still some potential to mow down weeds and soybeans to prevent seed production and even bigger problems next year. Infestation level in a few other fields was low enough to allow removal of Palmer amaranth plants by a crew of concerned people.

    Issue: 2017-27
  2. Author(s): Mark Loux

    An article in last week’s C.O.R.N.

    Issue: 2017-14
  3. Author(s): Mark Loux

    Replanting a corn field due to weather-related stand problems usually involves killing the first planting, which otherwise really just turns into a weed.  A recent article by Dr. Aaron Hager in the U.

    Issue: 2017-13
  4. Palmer amaranth in soybeans
    Author(s): Mark Loux

    When you finish every possible indoor task during this rainy spell, take a few minutes and check out our latest video on pigweed identification.  The video compares four aspects of pigweed biology that we use to differentiate between redroot pigweed, waterhemp, and Palmer amaranth – pubescence, petiole length, leaf shape, and inflorescence (seedhead) characteristics.  Find it at the OSU weed management website – http://u.osu.edu/osuweeds.  There are far worse ways to spend a few minutes.

     

    Issue: 2016-11
  5. Author(s): Mark Loux

    This is a revision of an article we seem to publish in C.O.R.N. about every three years, when wet weather prevents early planting and in some cases also prevents early burndown applications.  There have been opportunities to apply burndown herbicides in much of the state over the past several weeks, and some areas have made considerable progress on planting.  Other areas have made little progress.  We are probably not in a true “late planting situation” yet, but some of the state is now wet and not that warm, and more rain coming midweek.  

    Issue: 2016-10

Publications

  1. 12/2016

    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. 

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