Method
1. Small seedlings can removed by hand.
2. Saplings can be cut with hand-clippers or machete, and
the entire above ground stump is treated with an oil based
herbicide. If multiple stems are treated, a dye can be
used to mark treated stumps.
3. Basal bark application of herbicide is applied ca. 1-2 feet
above the base of the tree 8-12 inches completely around the
circumference of the tree.
3. Larger shrubs and trees are cut approx. 0.5-3.0 feet
above the ground with a chainsaw (see photo below). The
top 8-10" of the above ground stump and cambium layer are treated with an oil
based herbicide.
Cut stump treatment
Herbicide (label information on each herbicide can be
obtained by the specific herbicide)
10% solution of Garlon
4 and 90% spray adjuvant such as Cidekick.
Monitoring
Site visits are made every 1-3 months and any new growth or
re-sprouts are treated with herbicide. many invasive
plants require an additional or several hrbicide treatments.
Resprouitng lantana on Red Hill 2 months after treatment
The Biology Of Shrubs and Trees: Shrubs and trees are typically easier to treat and control than other species such as grasses and Old World climbing fern because shrubs and trees are more conspicuous, often grow from one base, and seed only one time per year. Many of the invasive trees and shrubs were introduced as landscape plants and exhibit showy flowers and produce numerous seeds. Seeds are often spread by birds and other animals that eat the fruits. However, there are many exceptions and the growth form and life stage of each species should be considered prior to treating each plant. For example, species such as Indian rosewood and lantana have "runner roots" growing along the ground that may sprout several feet away from the parent plant. Each of these runner roots and sprouts need to be treated to control the plant population. Other species such as Brazilian pepper often re-sprout at the base and need to be re-treated again after the initial treatment.
