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C.O.R.N. Newsletter

  1. Midwest Mechanical Weed Control Field Day – Sept. 27, 2023

    Author(s): Eric Richer, CCA , Author(s): James Jasinski

    Are you looking for new ways to manage resistant weeds or are you just looking for something to do the week after Farm Science Review? I encourage you to attend the Midwest Mechanical Weed Control Field Day on September 27, 2023, held this year in Wooster, Ohio at the CFAES Wooster main campus research farm. 

    Issue: 2023-31

  2. Alternative Spring Burndown/Postemergence Strategies when Herbicides are in Short Supply

    Author(s): Mark Loux

    Note:  This article represents the combined thinking of weed scientists from Indiana, Kentucky, Michigan, Ohio and Pennsylvania

    Issue: 2021-40

  3. Rye can be a pesky weed.

    Author(s): Mike Gastier, CCA

    In recent years Ohio has seen a huge resurgence of rye usage as a cover crop. While rye can be a good option as a cover crop, it is also a persistent threat as a weed in subsequent crops and neighboring fields. In parts of Ohio this season, volunteer rye is obvious in many crop fields. This is usually a minor threat to the crop, but in certain circumstances, it does create big problems.

    Issue: 2021-19

  4. Poison Hemlock Control

    Author(s): Mark Loux , Author(s): Curtis Young, CCA

    Poison hemlock remains one of the more persistent and prevalent poisonous weeds that we deal with in Ohio.  It's most typically a biennial plant (sometimes perennial), emerging from seed in year one and developing into a low-growing rosette by late fall.  The rosette overwinters and then resumes growth in the spring of year two.  Stem elongation initiates sooner in spring than many other biennials, and this is followed by continued growth and development into the often very tall plant with substantial overall size.  Flowering and seed production occur in summer. 

    Issue: 2020-07

  5. Omitting residual herbicides in soybeans – really - we have to have this argument again?

    Author(s): Mark Loux

    According to our network of sources, the effectiveness of new soybean trait systems has some growers once again thinking about omitting preemergence residual herbicides from their weed management programs.  Some people apparently need to learn the same lessons over and over again.  Having gone through this once in the early 2000’s when Roundup Ready soybeans had taken over and we all sprayed only glyphosate all day every day, we think we’re pretty sure where it leads.  We’re sensitive to concerns about the cost of production, but the cost-benefit analysis for residual herbicides is way in t

    Issue: 2020-05
  6. Herbicide Classification

    Take Action

    Author(s): Mark Loux

    The USB Take Action initiative and university weed scientists have developed a free webinar series covering various weed and herbicide management issues.  The webinar occurs every Thursday at 11 am EST through March 26.  Each webinar will have two weed scientists giving presentations about 15 minutes long, and there is opportunity for viewers to ask questions via the web portal.  The schedule is as follows:

    Feb 20

    Aaron Hager, University of Illinois – effective long-term management of waterhemp

    Travis Legleiter, University of Kentucky – spray deposition factors 

    Issue: 2020-04
  7. Winter annuals

    Fall Herbicide Treatments – Even More Important This Year?

    Author(s): Mark Loux

    If you have never applied herbicide in fall to burn down winter annuals, or done it only infrequently, this might be the year to make an investment in fall herbicides.  Fall treatments are an integral component of marestail management programs.  They also prevent problems with dense mats of winter annuals in the spring, which can prevent soil from drying out and warming up, interfere with tillage and planting, and harbor insects and soybean cyst nematode.  2019 was a generally tough year for weed control, leading to higher end of season weed populations in some fields.  A number of acres we

    Issue: 2019 - 33

  8. Reminders about Pre-harvest Herbicide Treatment

    Author(s): Mark Loux

    Information on preharvest herbicide treatments for field corn and soybeans can be found in the “Weed Control Guide for Ohio, Indiana, and Illinois”, at the end of these crop sections (pages 74 and 141 of the 2019 edition).  Products labeled for corn include Aim, glyphosate, and paraquat.  Products listed in the guide for soybeans include Aim, paraquat, glyphosate, and Sharpen.  Some dicamba products are also approved for preharvest use in all types of soybeans, which escaped our notice until now, so it is not listed in the guide.  The basic information for preharvest dicamba (for 4 lb./gal

    Issue: 2019 - 30

  9. No pigweed left behind - late-season scouting for 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 Palmer and waterhemp to develop resistance to any new herbicide sites of action that are used in POST treatments within about three cycles of use.  Preventing new infestations of these weeds should be of

    Issue: 2019-24

  10. The Ohio Noxious Weed Law - A Tool in the Prevention of Waterhemp and Palmer Amaranth

    Author(s): Mark Loux

    Waterhemp and Palmer amaranth are both now listed on the Ohio noxious weed law, which means that landowners must take steps to control infestations and prevent further spread.  Since these are annual weeds, preventing spread is achieved by preventing plants from reaching maturity and producing seed.  This is the basis for our “No pigweed left behind” effort, for which the goal is to create an understanding that the only way to beat these weeds is to prevent seed.  Prevention needs to occur in any area that might be subject to infestation, such as roadsides, parks, conservation seedings, par

    Issue: 2019-22

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