Poison Ivy Abounds Again
It seems like this is another good year for poison ivy
control as we’ve had several questions on how to control it. We
also hear the comment that a particular herbicide has been used
and it did not give acceptable control. In some of these cases,
the application may have been made too early or under conditions
of hot, dry weather. Fully developed plants that are actively
growing will be the most sensitive to herbicides. Several
herbicide options can be considered for specific habits.
Most often, poison ivy occurs in non-cropland sites. In these
settings, Arsenal (imazapyr), Garlon (triclopyr for non-crop
settings), Oust (sulfometuron), and Weedone 170 (2,4-D and
2,4-DP) control poison ivy. If poison ivy appears in pastures,
Crossbow (triclopyr and 2,4-D premix), Weedmaster (dicamba and
2,4-D premix), glyphosate, and Redeem (a prepackage mix of
triclopyr and clopyralid available in Minn. and Iowa that is
registered for use in Wisconsin) can be considered. Poison ivy
is not listed on the Redeem label but it is listed as a
controlled species on the Confront label and both products
contain the same quantities and formulations of triclopyr and
clopyralid.
In lawns, Confront (a formulation of triclopyr and clopyralid
premix available to professional turf groups) and Trimec (2,4-D,
MCPP and dicamba premix) can be used with little risk of injury
to the grass. In the rare event that poison ivy shows up in crop
land dicamba and glyphosate are probably the best alternatives.
In all cases, a single application will probably not be 100%
effective. Monitor treated sites and consider a late summer or
early fall treatment (before the leaves turn color) to control
escaping plants or be ready with a followup program next year.
July 2002 |
