C.O.R.N. Newsletter

  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
  6. Cover crops

    Cover crops provide multiple benefits with regards to protecting soil from erosion, improving soil health, and as a component of a nutrient management plan.  For those cover crops that over winter and resume growth in the spring, for example, cereal rye and annual ryegrass, an important question is when to terminate that cover crop.  That decision should consider the next crop, planting date of that next crop, the spring weather pattern and purpose of the cover crop.   For cover crops that have not been planted with the intention of providing a forage harvest, and that are on acres intended

    Issue: 2016-06
  7. Author(s): Mark Loux

    The number of new herbicide introductions has slowed down over the past couple years, and most of the “new” products are actually just a recombination of existing active ingredients.  The 2016 edition of the “Weed Control Guide for Ohio, Indiana, and Illinois” contains information on all but a few of the most recent products.  A pdf of the 2016 guide is available at http://u.osu.edu/osuweeds/, along with videos that summarize new products and technology (hard copy of the guide available by mid-December).  One of the big questions remaining about 2016

    Issue: 2015-38
  8. Water Stressed Corn in Ohio
    Author(s): Mark Loux

    1.  Wet weather has delayed POST herbicide applications in both corn and soybeans.  This can result in weeds and crops that are larger and more advanced in growth stage than anticipated.  The larger crop is primarily a problem in corn, where a more advanced growth stage can start to limit herbicide options.  Be sure to check labels and the OH/IN/IL Weed Control Guide for information on maximum crop size and stage for herbicides (Table 8 on page 68 of 2015 edition).  Larger weeds may require higher rates or more complex POST herbicide mixtures.  Glyphosate and Liberty rates can be increased

    Issue: 2015-18
  9. Author(s): Mark Loux

    While a variety of rainfall and soil moisture conditions can be found around Ohio, a shortage of rain following application of residual herbicides seems to be common.  We are hearing about weeds emerging early in the season even where residual herbicides were applied, which is an indicator of inadequate herbicide “activation”, or lack of downward movement into the upper inch or two of soil where weed seeds germinate.

    Issue: 2015-14
  10. Flat-fan overlap
    Author(s): Erdal Ozkan

    Spraying season is just around the corner. Just take a moment to review some common sense ideas I will mention here to get the most out of those expensive pesticides you will be spraying. The following “Top Ten” list will help you improve the performance of your sprayer and keep it from failing you: 

    Issue: 2015-11