Quantcast Postemergence Herbicides to Control Grasses in Ornamental Plantings

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POSTEMERGENCE HERBICIDES TO CONTROL GRASSES IN ORNAMENTAL PLANTINGS
Herbicide (pounds/
Time of
Weeds
acre; cost/pound)
Con trolled
Application
Remarks
Fluazifop (0.25-0.5, EC;
Postemergence, when
Annual grasses and some
Nonionic surfactant at 1 qt/100 gal spray increases
$74.75/lb)
grasses are actively grow-
perennial grasses, such as
effectiveness. This herbicide is mainly a foliage-absorbed
ing.
quackgrass and bermuda-
systemic. Do not apply fluazifop if rainfall is expected
grass up to 8 inches tail
within hour. It generally kills grasses without injuring
and Johnsongrass 15-20
associated broadleaf plants. Certain plants may be in-
inches tall.
jured, such as certain varieties of azaleas (Hinocrimson
and Poukhanensis). Directed sprays to avoid the foliage is
recommended for these. Perennial grasses vary in their
susceptibility, and repeated applications may be necessary.
Other preemergence herbicides will be needed to control
broadleaf weeds and to provide residual control of grasses
that will come from seed.
Sethoxydim (0.3-0.5,EC;
Postemergence, when
Annual grasses and some
Use of a crop-oil concentrate at 1 qt/a or 1 percent by
$74.00/lb)
grasses are actively grow-
perennial grasses such as
volume of herbicide spray increases effectiveness of the
ing.
quackgrass and bermuda-
spray. This herbicide is a foliage-absorbed systemic herbi-
grass up to 8 inches tall
cide and provides no residual weed control. It is generally
and Johnsongrass 15-20
without effect on broadleaf species and can thus be
inches tall.
sprayed over most woody plants and many annual and
perennial broadleaf plants. Perennial grasses vary in their
susceptibility, and repeated applications may be necessary.
Other preemergence herbicides will be needed to control
broadleaf weeds and provide lasting control of grasses
from seed.





 


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