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Agronomic Crops Network

Ohio State University Extension

CFAES

Waterhemp

C.O.R.N. Newsletter Articles

  1. Water Hemp
    Author(s): Alyssa Essman

    Waterhemp and Palmer amaranth plants that have escaped POST applications or emerged after are now starting to develop mature seed. These plants can produce upwards of one million seeds per plant in certain situations. When it comes to the management of these weeds, the best offense is a good defense. Anything we can do from now through harvest to prevent seed from being deposited into the soil seed bank will pay dividends down the road. At this point in the season there are limited options for control beyond scouting and hand pulling.

    Issue: 2022 - 30
  2. We have been screening a random sample of waterhemp populations for herbicide resistance over the past two years.  Herbicides used in the screen include mesotrione, atrazine, 2,4-D, fomesafen, and metolachlor.  Results of our research show that it’s possible for Ohio waterhemp populations to have some level of resistance to one, several, or all of these herbicides.  Glyphosate is not included because we assume almost all populations are already resistant to this.  We are also part of a regional project that has been screening for dicamba and glufosinate resistance with populations that we s

    Issue: 2021-24
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