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 HERBICIDES FOR WOODY PLANTS -- Continued
Woody Plants
Treatment (pounds/
Time of
Remarks
Controlled
acre; cost/pound)
Application
A RESTRICTED HERBICIDE. Usually used as a foliage
Many species of woody
Picloram(0.S-2; $42.50/lb)
Full-leaf stage when plants
plants, including: black-
spray in mixtures with other herbicides such as 2,4-D;
are actively growing. Also,
dicamba; and triclopyr. While more efficient when applied
berries, buttonbush, cac-
soil treatments are effec-
tus, acacias, cedar, chap-
as a foliage spray, it is effective and used also as a soil
tive anytime when enough
treatment. Persistence time in the soil is greatest in cool
parral species, dogwood,
rainfall is expected to leach
firs, gorse, guava, gums,
climate and in heavy solids, and may exceed a year. Take
herbicide to the roots.
particular care to avoid drift in nontarget sites, and avoid
hickory, juniper, kudzu,
use on sites where runoff water can carry the herbicide to
lantana, live oak, locust,
maple, mesquite, oak, per-
desirable broadleaf plant species or to streams or im-
simmon, pine, roses, sal-
pounded water. Does not kill grasses.
monberry, sassafras, trum-
pet creeper, and willows.
Most woody species, as
Nonselective soil treatment, and should be used only
Tebuthiuron(4-6; $18.50/lb)
Anytime when enough rain
where bare soil is desirable. Herbicide persists in soil for
well as other vegetation.
is expected to move herbi-
more than a year. Do not use on areas such as walks,
cide into the root zone.
driveways, streets, patios, tennis courts, swimming pools,
cemeteries or other landscaped areas. Do not apply in
locations where the chemical may be washed by runoff or
sheet erosion to areas having roots of desirable vegetation.
Do not apply on an area into which the roots of desirable
vegetation may extend. Roots of trees and shrubs may
extend for beyond the drip line of the plants' branches.
A selective foliage spray, but it can also be absorbed from
Many species including
Triclopyr(1-8; $15.50/lb)
Full-leaf stage and when
soil. It does not kill grasses. It is often used in mixtures
beech, birch, blackberry,
plants are actively grow-
with 2,4-D and picloram to increase range of species
cherry, cottonwood, hazel,
ing.
controlled. Usually does not persist for more than one
hickory, locust, persim-
season. The ester formulation in fuel oil is effective as
mon, poison oak, poplar,
basal bark and dormant brush treatment. Take precau-
salmonberry, sassafras, su-
tions to prevent drift to nontarget susceptible species.
mac, sweetgum, sycamore,
tulip poplar, and willow.
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