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 The most common
methods of killing brush with herbicides for landscape maintenance are stump treatments, basal bark treatments, and foliage treatments.
For the last two methods, shrubs would still have to be cut and
removed after killing them to maintain fire resistance.
-
Stump
treatments reduce
sprouting very effectively. Immediately (within an hour) apply a
very small amount of undiluted herbicide to the perimeter of
freshly cut stump surfaces.
-
Basal
bark treatments are
applied directly to the stems at the base of the plant. They
usually require a specific additive and may be applied during
either the growing or dormant season.
-
Foliar
treatments involve
spraying the whole plant after it is fully leafed out. Timing
varies according to the herbicide used. Timing is important to
make sure the plant moves the herbicide into the roots.
The herbicides
listed in the table below are labeled for a wide range of shrubs
found in northern Idaho. Some are marketed to homeowners and are
typically available in local home and garden centers. Others are
targeted to larger forest owners or forestry contractors. They are
often packaged differently (e.g., in larger containers) and may have
to be specially ordered.
Before
purchasing and applying a herbicide, make sure that you have
correctly identified the plants and the herbicide is labeled for
them. Regardless of the herbicide, always read and precisely follow
the label recommendations before using it.
Herbicides for Forest
Shrubs in Idaho – 2003
|
Brush Species |
Application
type |
Herbicide |
|
2,4-D |
Triclopyr
(e.g., “Garlon”) |
Dicamba
(e.g., “Banvel”) |
Glyphosate
(e.g., “Round-up”) |
Imazapyr
(e.g., “Arsenal”) |
Metsulfuron
(e.g., “Escort”) |
|
Alder |
Foliar |
X |
X |
X |
X |
X |
-- |
|
Cut stem |
X |
X |
X |
X |
X |
-- |
|
Basal
Bark |
X |
X |
-- |
-- |
X |
-- |
|
Serviceberry |
Foliar |
. |
X |
X |
X |
-- |
X |
|
Cut stem |
-- |
-- |
-- |
-- |
-- |
-- |
|
Basal
Bark |
-- |
X |
-- |
-- |
-- |
-- |
|
Chokecherry |
Foliar |
X |
X |
X |
X |
X |
X |
|
Cut stem |
-- |
-- |
-- |
-- |
-- |
-- |
|
Basal
Bark |
X |
X |
-- |
-- |
-- |
-- |
|
Rocky
Mountain
Maple |
Foliar |
-- |
X |
X |
-- |
X |
-- |
|
Cut stem |
-- |
-- |
-- |
-- |
-- |
-- |
|
Basal
Bark |
-- |
X |
-- |
-- |
-- |
-- |
|
Ninebark |
Foliar |
X |
-- |
-- |
-- |
-- |
-- |
|
Cut stem |
-- |
-- |
-- |
-- |
-- |
-- |
|
Basal
Bark |
-- |
-- |
-- |
-- |
-- |
-- |
|
Oceanspray |
Foliar |
|
|
-- |
X |
-- |
X |
|
Cut stem |
-- |
-- |
-- |
-- |
-- |
-- |
|
Basal
Bark |
-- |
-- |
-- |
-- |
-- |
-- |
|
Snowberry |
Foliar |
X |
X |
|
X |
X |
X |
|
Cut stem |
-- |
-- |
-- |
-- |
-- |
-- |
|
Basal
Bark |
-- |
-- |
-- |
-- |
-- |
-- |
|
Shiny
leaf ceanothus |
Foliar |
-- |
X |
-- |
X |
X |
X |
|
Cut stem |
-- |
-- |
-- |
-- |
-- |
-- |
|
Basal
Bark |
-- |
|
-- |
-- |
-- |
-- |
|
Redstem
ceanothus |
Foliar |
X |
X |
-- |
X |
X |
X |
|
Cut stem |
-- |
-- |
-- |
-- |
-- |
-- |
|
Basal
Bark |
-- |
-- |
-- |
-- |
-- |
-- |
|
X
= control is fair to good; blank = poor to no control;
-- = insufficient information |
[1] To simplify
information, trade names have been used. No endorsement
of named products is intended nor is criticism implied of
similar products not mentioned. Herbicide guidelines in this
document are good only for 2003 and are not meant to
substitute for the label. After 2003, consult the Pacific
Northwest (“PNW”) Weed Management Handbook, which is updated
annually by Pacific Northwest Land Grant Universities
(available online at:
http://weeds.ippc.orst.edu/pnw/weeds) for the
most current recommendations.
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