| There are currently 2 different types (known as 'biotypes') of herbicide resistant weeds in New Hampshire. The first herbicide resistant weed reported from New Hampshire is Redroot Pigweed (Amaranthus retroflexus) with resistance to atrazine, reported in 1984. Local weed scientists estimate that there are 40 sites and more than 1,100 acres infested with herbicide resistant weeds in New Hampshire and they infest corn. The most widespread resistant weed of New Hampshire is Redroot Pigweed (Amaranthus retroflexus), which infests an estimated 501-1000 acres and is found primarily in corn. Lambsquarters (Chenopodium album), with resistance to atrazine is the most recently discovered (1986) new type of resistant weed in New Hampshire. |
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This is a resource page to assist you in
managing herbicide-resistant weeds in New Hampshire . If you have any questions regarding herbicide-resistant
weeds in New Hampshire please contact an
expert in your area. If you have encountered a computer related error on the site then contact
support@weedscience.org. If you are a weed scientist wanting to add or correct information on this page then please contact
research@weedscience.org
or add the
information directly.
Scroll down this page to view tables on
herbicide resistant weeds in New Hampshire and its adjacent states as well as a list of articles about
herbicide resistant weeds in your region. Click on the links within
the table to view a case of resistance in more detail.
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Redroot Pigweed (Amaranthus retroflexus) is the most widespread resistant weed of New Hampshire