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Agronomic Crops Network

Ohio State University Extension


C.O.R.N. Newsletter

  1. Marestail (Horseweed)
    Author(s): Mark Loux

    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
  2. cressleaf groundsel flowers
    Author(s): Mark Loux

    It’s definitely a big year for cressleaf groundsel (Senecio glabellus), that yellow-flowered weed that can be seen about everywhere right now.  While it is most often found in no-till corn and soybean fields that have not yet been treated with burndown herbicides, there seems to be an above-average number of wheat and hayfields and pastures with substantial populations.  Cressleaf groundsel can be identified by its hollow and grooved stem with a purplish color, and yellow sunflower-type flowers.  It is a winter annual that emerges in late summer into fall, and can infest late-summer seeding

    Issue: 2016-13
  3. There are three excellent field day opportunities being planned for small grain producers across the state. The three days cover a variety of production issues, nutrient management practices, and small grain uses. Locations are in Pickaway, Wayne and Wood Counties. Be sure to check out the location closest to you! For detailed information visit:

    June 1, Pickaway County, On-Farm Wheat Field Day, 19076 Florence Chapel Pike, Circleville at 9 am.

    Issue: 2016-11
  4. Winter wheat progress 3-7-16
    Author(s): Laura Lindsey , Author(s): Ed Lentz, CCA , Author(s): Pierce Paul , Author(s): Mark Loux

    On March 16 and 17, we visited our wheat trials in Clark County and Pickaway County. Both locations were at Feekes growth stage 5 (leaf sheath erect). In northwest Ohio, wheat is at green-up to Feekes growth stage 4.

    Generally, Feekes growth stage 6 occurs in southern Ohio during early April; however, with abnormally warm temperatures, Feekes growth stage 6 (jointing) may occur sooner. To evaluate wheat for growth stage 6 follow these steps:

    1- Pull, or better yet, dig up, several clusters of tillers with roots and soil from multiple locations in the field;

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

    This summer’s weather caused problems with weed control in some areas of the state, and this certainly includes our two major weeds, giant ragweed and marestail.  As we move through harvest and into the season of wheat planting and fall herbicide application, be sure that strategies effectively address marestail since there is an abundance of marestail seed blowing around.  The larger plants evident now in wheat stubble or above the soybean canopy may be producing seed, but these are not the plants that will overwinter and cause problems next spring.  The small marestail plants that have ju

    Issue: 2015-29
  6. Author(s): Laura Lindsey , Author(s): Eric Richer, CCA , Author(s): Pierce Paul

    Growers are interested in wide-row wheat production due to reductions in equipment inventory (i.e., lack of grain drill) and to allow intercropping of soybean into wheat. With funding from the Ohio Small Grains Marketing Program and the Michigan Wheat Program, we’ve conducted row width trials to examine variety selection and seeding rate. Here are some considerations if you plan on growing wheat in wide rows this fall:

    Issue: 2015-27
  7. 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
  8. Author(s): Laura Lindsey , Author(s): Pierce Paul , Author(s): Ed Lentz, CCA , Author(s): Mark Loux

    The winter wheat crop is greening up and as such growers will need to pay attention to crop growth stage in order to make adequate management decisions. Wheat growth stage identification is critical for effective timing of fungicide, insecticide, herbicide, and fertilizer applications.

    Issue: 2015-08
  9. Author(s): Erdal Ozkan

    It is very likely you have already completed the harvest season, and in the process of storing all the equipment in a proper place. One piece of equipment requires more attention than others when putting it in the storage place. It is your sprayer. If you want to avoid potential problems and save yourself from frustration and major headaches, you will be wise to give your sprayer a little bit of TLC (Tender Loving Care) these days. Yes this is still a busy time of the year for some of you, but don’t delay winterizing your sprayer any more than necessary.

    Issue: 2014-38
  10. Author(s): Mark Loux

    There are effective late-fall post-emergence options for management of dandelion and winter annual weeds in wheat for use mostly in those fields that were not treated with burndown herbicides prior to emergence.  For late-planted fields where wheat has not emerged, it’s still possible to use the full range of burndown herbicides discussed in a previous article (  A couple of questions we received lately about burndown include:

    Issue: 2014-37