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 PREEMERGENCE TREATMENTS TO CONTROL WEEDS IN ORNAMENTAL PLANTINGS -- Continued
Herbicide (pounds/
Time of
Weeds
Remarks
acre: cost/pound)
Controlled
Application
A repeated treatment is needed for seasonal control.
DCPA (10-12,WP or G;
Preemergence to weeds.
Many annual grasses, and
$6.30/lb)
Resistant broadleaf weeds are ragweed, galinsoga, and
some broadleaf weeds for
many others. Registered for use on 52 ornamental annu-
2-3 months.
als, perennials, and bulbs, several ground covers, and a
broad range of woody plants and turfgrasses. It is no
hazard downslope. It is a safe choice for pathways
(baseball fields), patios, flower beds, and mixed plantings.
Dichlobenil (4-6, WP&G;
Highly volatile, and has been consistently effective when
Broad range of annual and
Late fall or early spring,
applied in late fall or early spring just before snow or
$31.00/lb)
perennial weeds, including
preemergence.
rain, or just before mulching in the spring. Safe on many
nutsedge, quackgrass, field
woody plants and certain ground covers, but not herba-
horsetail, mugwort, and
ceous plants or bulbs. Also susceptible are azaleas,
dandelion.
hemlocks, true firs (Abies spp) and Douglas-fir. Dormant
applications should be followed in the spring with a
preemergence annual grass herbicide. Moderate to high
hazard to turfgrass downslope unless treated area is
mulched. A good choice for control of many established
perennial weeds in established tolerant woody plants.
Controls weeds for 2-4 months. Resistant weeds are
Diphenamid (4-6, WP;
Preemergence, before light
Annual grasses and several
ragweed, galinsoga, and many other broadleaf weeds.
$7.75/lb)
rain or sprinkler irrigation.
broadleaf weeds, such as
Safe on several herbaceous plants, ground covers, dichon-
carpet weed, chickweed,
dra, and a broad range of woody plants. Moderate hazard
knotweed, lambsquarters,
to turfgrass downslope.
pigweed, purslane, and
smartweed.
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