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 POSTEMERGENCE TREATMENTS TO CONTROL WEEDS IN ORNAMENTAL PLANTINGS -- Continued
Herbicide (pounds/
Time of
Weeds
acre; cost/pound)
Remarks
Application
Application
Glyphosate (1-5, water solu-
Postemergence for most Most annuals and perenni-
Kills almost all plants treated. Will control most weed and
perennials at bud to early als, and some brush spe-
brush species at the correct stage of growth: quackgrass,
ble liquid; $26.30/lb)
bloom stage.
bermudagrass, and mugwort at 6-8 inches tall; bindweed,
cies.
horsenettle, and Johnsongrass at flowering stages or later;
poison ivy and other woody plants August to late Septem-
ber but before frost and when moisture is good and plants
are actively growing; Japanese knotweed (Polygonum
cuspidatum) at full height (6-8 feet tall) and cut down
about 3 weeks later and then spray sparse regrowth.
Glyphosate does not injure trees when applied to trunks
with mature bark, but repeated spraying of suckers can
kill the root system if suckers are large. In addition to
sprays, wiper applications of glyphosate at 1-2 parts of
water provide selective ways of controlling established
weeds in many types of landscape plantings. Glyphosate
presents little or no hazard to adjacent or downslope turf.
Paraquat (0.5-2, water solu- When growth is young and Nonselective, mostly an-
A nonselective herbicide that is a RESTRICTIVE HERBI-
ble liquid; $23.50/lb)
succulent.
CIDE and not registered for use around homes. Handle
nual species.
carefully as per label. Repeated or concentrated sprays on
barks of trees or shrubs cause girdling. Not active in soil.
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