C.O.R.N. Newsletter

  1. Author(s): Mark Loux

    Having to issue a retraction to previous C.O.R.N.

    Issue: 2019-05
  2. cereal rye cover crop
    Author(s): Mark Loux

    OSU weed scientists are in the process of planning cover crop research, and could use your input. Cover crop use has been on the rise in recent years, most commonly for the preservation of soil, reduction in nutrient loss, and suppression of weeds they can provide. Feedback from this survey will allow us to perform trials that are in line with practices common in the state of Ohio and thus generate more impactful results. Thank you!

    Please take our five second survey!

    Issue: 2018-23
  3. Seed heads of Palmer amaranth and waterhemp
    Author(s): Mark Loux

    If you don’t already have to deal with waterhemp or Palmer amaranth, you don’t want it.  Ask anyone who does.  Neither one of these weeds is easy to manage, and both can cause substantial increases in the cost of herbicide programs, which have to be constantly changed to account for the multiple resistance that will develop over time (not “can”, “will”).  The trend across the country is for them to develop resistance to any new herbicide sites of action that are used in POST treatments.  Preventing new infestations of these weeds should be of high priority for Ohio growers.  When not adequa

    Issue: 2018-23
  4. Author(s): Mark Loux

    This is the time of year when we received our first call about dicamba problems in soybeans in 2017.  We can probably expect any problems to become evident soon, based on the timing of postemergence applications and timeline for development of symptoms.  Off-target issues have already developed in states farther west and south, and we would expect at least some to occur here, unless we’re really lucky.

    Issue: 2018-19
  5. Cressleaf Groundsel. Source: S. Noggle, 2017
    Author(s): Sarah Noggle

    Many questions come into the County Extension Office daily.  Many times those include a question about a weed identification.  During the month of June 2018, OSU Extension will be featuring a weed identification of the week.  This week's weed is cressleaf groundsel, Senecio glabellus. 

    Issue: 2018-16
  6. Author(s): Cindy Folck

    Do you know the weather conditions that contribute to inversions? A workshop on April 10 will focus on tools to help farmers recognize inversions and other weather conditions that affect drift. Aaron Wilson, weather specialist and atmospheric scientist, will discuss weather trends and how to recognize inversions. Additionally, workshop attendees will learn about the new tools available through the Ohio Sensitive Crop Registry by Field Watch to increase communication between field crop and specialty crop growers.

    Issue: 2018-07
  7. Author(s): Mark Loux

    We have had reports of dodder in some red clover fields.  Dodder is a parasitic plant without any leaves or chlorophyll to produce its own energy.  It lives by attaching to a host with small appendages (called ‘haustoria”), and extracting the host plant’s carbohydrates. The stems are yellow-orange, stringlike, twining, smooth and branching to form dense masses in infested fields.  Although neither toxic nor unpalatable to some livestock, dodder can weaken host plants enough to reduce yield, quality, and stand.  If infestations are severe enough, dodder may kill host plants.  

    Issue: 2017-34
  8. 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
  9. Author(s): Mark Loux

    One of the requirements for the registration of XtendiMAx, Engenia, and FeXapan is the investigation of any non-performance (ineffective control) by the respective companies, which then has to be reported to the USEPA.  The goal of this reporting is apparently to try to track the development of resistance as soon as it occurs in a few fields, which would then allow time to modify practices so that the rate of resistance in other fields is slowed.  We encourage growers and consultants to take the time to scout for non-performance, within 14 days after application according to information fro

    Issue: 2017-12
  10. Author(s): Mark Loux

    As a result of the warm winter and early spring, weed growth in no-till fields is ahead of schedule.  Fields not treated with burndown herbicides last fall or during the earlier drier period this spring can have some large weeds at this point.  Many fields need time to dry out following the most recent rains before they will tolerate traffic, which will allow weeds to get even larger and more challenging to kill.  Large marestail can be especially problematic due to the combination of glyphosate and ALS resistance in most populations.  Cool weather can reduce the activity of the herbicides

    Issue: 2017-12

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