The Rural Voice, 2001-07, Page 43Advice
grow. They looked ,quite stunted
though, but they might be able to
eventually set seed.
At this stage, the Group 2 resistant
common ragweed populations have
been found in Essex, Kent, Lambton
and Durham counties. Group 2
resistant Eastern -black nightshade
populations, which were confirmed
earlier this year, have been found in
Elgin and Kent counties. As for the
resistant green and redroot pigweeds
that were first identified in 1997, they
have been reported in Essex,
Lambton, Elgin. Middlesex, Huron,
Perth, Oxford. Brant, and Norfolk
counties.
Resistance is generally selected
when the same herbicide or
herbicides from the same group are
used repeatedly over the years:
however one should not dismiss the
importance of seed dispersal in
spreading around resistance. Seeds of
these plants can be spread by
equipment, particularly combines and
also by birds. Common ragweed may
present a more complicated case as it
is, unlike the other species, relying
more on cross-pollination to ensure
seed production. Researchers in
Ohio, where this problem has
previously been documented, suspect
some spread of herbicide resistant
common ragweed by pollen that
blows from one field to another.
Group 2 herbicides are very
popular and include arange of
widely used products. A key strategy
to reduce your potential for resistance
is to use a crop rotation that brings a
greater range of herbicides into play.
Tank mixing with other herbicides
that are not group 2 and that also
control the potentially resistant
weeds is also a good strategy. Other
non -chemical methods for weed
control will also be part of a
successful resistance management
program. 0
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JULY 2001 39