C.O.R.N. Newsletter

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. Author(s): Mark Loux

    Gramoxone SL (paraquat) is one of those herbicides that in our opinion really could have been used much more than it has in recent years, to help with management of marestail and to interrupt the cycle of continuous glyphosate use. A relatively high price has been one of the obstacles to more widespread use, but the price was cut approximately in half this winter.

    Issue: 2017-06
  8. Author(s): Erdal Ozkan

    OSU Extension, OARDC and Ohio Department of Agriculture will be offering a spray drift management workshop on April 20th from 9 am to 3 pm at the OARDC Weed Lab (Room 200 FABE) in Wooster.  Instructors will include Doug Doohan, Roger Downer, Professor Erdal Ozkan – Extension Agricultural Engineer, and Matt Beal, ODA Chief of Division of Plant Health.

    Topics will include causes, cures, and regulatory issues.  Lunch and coffee will be provided.  Cost will be $20. Participation limited to 20-25 people.

    Issue: 2017-06
  9. Author(s): Jeff Stachler

    Every fall County Extension Educators drive through their county evaluating weed control in soybean fields to see how weed populations are changing over time.  This is my second year of doing this survey, but John Smith had done it before me.

    Issue: 2016-32
  10. Author(s): Mark Loux

    1.  Cressleaf groundsel, which is poisonous to livestock, has caught some hay and livestock producers by surprise when they discover it in late spring in hay or pasture.  Some hay producers have had to discard hay from first cuttings due to an abundance of this yellow-flowered weed.  Cressleaf groundsel is a winter annual weed that is easily controlled in the fall, when in the rosette stage, in most crop situations.  Take time to scout fields this fall to determine whether cressleaf groundsel is present, especially in new summer seedings or fields with a history of this weed problem.

    Issue: 2016-31

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