www.stma.org April 2015 | SportsTurf 49
There are several herbicides that have shown good efficacy in
controlling Poa if applied at the right frequency and rate. As with
any pesticide program it is important to rotate products that have
differing modes of action, to prevent the development of herbicide
resistance.
Preemergence herbicides are chemical products that form a barrier
at the soil surface and prevent weed seed germination. Their use on
athletic fields is precarious because they may also prevent the germina-
tion of desirable grass seed. Herbicides that can be used at the same
time as seeding include siduron (Tupersan), mesotrione (Tenacity),
quinclorac (XLR8 and Drive) and topramezone (Pylex).
Postemergence herbicides are chemical products that control
emerged, visible weeds. These include selective herbicides like etho-
fumesate (Prograss), amicarbazone (Xonerate), mesotrione (Tenacity)
and topramezone (Pylex). A non-selective option (something that
kills all green plants) used for simple spot-treatment or renovation is
glyphosate. Examples of potential herbicide programs for cool-season
grass athletic fields are as follows. In each case, it is best to experiment
with these herbicide programs on small areas first before implement-
ing a full scale treat-the-whole-field program.
Ethofumesate (Prograss) has been available for many years. It is
recommended to be applied in the fall using 2 to 3 sequential applica-
tions at 3 to 4 week intervals, with a possible single spring follow-up.
Please read the label for seeding restrictions.
Amicarbazone (Xonerate) is recommended to be applied in the
spring when air temperatures are cooler than 85ºF. Four (4) sequential
applications at 7-10 day intervals at a low rate of 1oz product per acre.
It is imperative to use the low rate, as higher rates can cause injury.
Mesotrione (Tenacity) and amicarbazone (Xonerate) in combina-
tion at 2 oz and 1 oz product per acre respectively has given excellent
results in Dr. John Street's research at Ohio State and allows the appli-
cation frequency to be reduced to 2 applications at 3 week intervals.
Topramezone (Pylex) is in the same chemical family as mesotri-
one (both pigment inhibitors) but both alone show limited activity
on Poa. Combinations with amicarbazone have shown enhanced
Pylex activity.
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