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 This perennial weed has deep vertical roots for food
storage and horizontal roots thatspread the weed
vegetatively. Shoots emerge from this extensive root
system in the spring. Flowers appear in late June, and
seed is dispersed in July. The shoots die after the seed is
dispersed. New shoots appear in late summer and grow
vegetatively until frost. These fall shoots make food for
the roots and do not flower.
Roundup Ultra 4SC(glyphosate). Apply in late
June when Canada thistle has flower buds or flowers, or in
the fall after the shoots are 6 to 8 inches tall, but before
frost. Roundup translocates into the vertical roots of the
plant well, but in less quantity into the horizontal roots.
Follow-up spot treatments may be needed to control
regrowth from pieces of horizontal roots that were not
killed by the initial application. (See warning in the
"Tree Fruit Herbicide Recommendations" section of this
bulletin.)
Broadcast:3 lb ai/A. Use 3 qt/A Roundup Ultra
4SC.
Spot treatment:2 - 5% solution. Use 2 - 5 gal of
Roundup Ultra 4SC/100 gal spray solution. Wet weed
foliage as thoroughly as possible. Use the 2% solution
when 100 percent of the weed foliage can be wet. Use up
to 5% solution when only partial wetting of the weed
foliage is possible. Wet a minimum of 50 percent of the
weed foliage for effective control.
Ropewick:Wipe twice; travel in opposite directions
for each wipe.
For newly planted (nonbearing) apples, peaches,
pears, plums, and cherries.
For established (bearing) apples, peaches, pears,
plums, and cherries.
This is a biennial in the southern states. Seeds
germinate in the late summer or fall, and the plant
overwinters as a rosette. Flowers are produced the
following summer, and the plant dies. Whether
camphorweed seedlings overwinter in New Jersey or
originate from seed that germinates in the spring is
unknown.
2,4-D--1 lb ai/A.Use 1 qt/A Weedar 64 or OLF.
Apply in the early spring after camphorweed seed has
germinated, but before the plants begin to bolt. (See
warning in the "Tree Fruit Herbicide Recommendations"
section of this bulletin.)
For established (nonbearing) apples and pears,
peaches, plums, and cherries.
Roundup Ultra 4SC(glyphosate).Apply when the
weed is growing rapidly. (See warnings in the "Tree
Fruit Herbicide Recommendations" section of this
bulletin.)
Broadcast:1-2 lb ai/A. Use 1-2 qt/A Roundup Ultra
4SC.
Spot treatment:1% solution. Use 1 gal Roundup
Ultra 4SC/100 gal spray solution.
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Ropewick:Wipe after the plant bolts and is tall
enough to contact wicks in late June or July.
For newly planted (nonbearing) apples, peaches, pear,
plums, and cherries.
For established (bearing) apples, peaches, pears,
plums, and cherries.
This perennial plant grows actively during the spring
and fall. Flowering in the spring coincides with many
fruit tress and may interfere with pollination by attracting
bees away from the trees. This weed is known to be an
alternate host for the stem-pitting virus of peaches and
other stone fruits.
2,4-D--1 lb ai/A.Use 1 qt/A Weedar 64 or OLF.
Apply in the fall after harvest or in early spring after the
weed is growing actively but before flowers appear. Spray
the vegetation-free zone under the fruit trees and the sod
between the tree rows. 2, 4-D will not harm established
sod. (See warning in the "Tree Fruit Herbicide
Recommendations" section of this bulletin.)
For established (bearing) apples, pears, peaches,
plums, and cherries.
Roundup Ultra 4SC (glyphosate).Apply when the
weed is growing actively and has flower buds. Spring or
fall applications may be more effective than applications
made in midsummer. (See warnings in the "Tree Fruit
Herbicide Recommendations" section of this bulletin.)
Broadcast:4 - 5 lb ai/A. Use 4-5 qt/A Roundup
4SC.
Spot treatment:2% solution. Use 2 gal Roundup
4SC/100 gal spray solution.
Ropewick:Not recommended.
For newly planted (nonbearing) apples, peaches,
pears, plums, and cherries.
For established (bearing) apples, peaches, pears,
plums, and cherries.
These closely related weeds are perennials that begin
growth in April from rosettes or rootstocks. Typically,
yellow blooms appear in late summer and the stems die
in the fall. Some regrowth, as short stems or rosettes,
often occurs before winter. Strong root systems
overwinter and resume growth in the spring. The weeds
spread using underground horizontal roots. Once
established, control of this weed is difficult, since it is
tolerant to most herbicides and the roots can be spread by
cultivation or other tillage practices.
Roundup Ultra 4SC (glyphosate). Apply in May
or June after spring growth is 8 to 10 inches tall, but
before the shoots become too tall for good coverage with
the spray solution. Generally, broadcast sprays must be
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