PERMFILE121277

• Permit No: M2000089
• IBM Index Class Name: Permit File
• Doc Date: 9/8/2000
• Section_Exhibit Name: EXHIBIT A LOCATION MAP
• Media Type: D
• Archive: No

INTEGRATED PEST MANAGEMENT
OF SELECTED HEEDS

No single control method should be
used in managing weeds. A combination
of methods.llPM1 strould be used. An
integrated pest management plan deals
with prevention as well as control.
Eradication of weed species is not a
practical goal but reducing
infestation to mar+ayealrle levels
strould be the oh.lective.
DIFFUSE AND SPOTTED KNAPNEEU
CulEural
Plant competition is an effective
way to prevent the Invasion of
knapweed. Proper management of
perennial grasses will inhibit
the establishment.of this weed.
Overgrazing is a maior cause of
perennial weed invasion. In Douglas
County, one horse requires 35 to 40
acres of pasture land if no
supplemental feed is provided.
Residents should consider the above
facts when planning recreational or
hobby activities as it pertains to
horses. A general rule of tlrumtr to
prevent overgraziny, is the lake••
Ira-f leave-half principle. A stand
of grass will maintain or even
improve its condition if no more
than one-half of its annual
production is used. in other words,
animals could graze until, orr
average, fifty percent of ttre grass
has been utilized. Animals would
then be removed until the vegetation
recovers its original height.
Dther cultural methods include:
- fertilization v,tren ner_e=_sary
lA soil test is the best way to
determine fertilization urr a site.
Contact the Douglas County Extension
Office for sail test I:its.i
- water management
- where the perennial
vegetation has been depleted,
reseedirny adapted varieties is
recommended
- disturbed areas r;Irould bra
revegetated as soon as possible to
prevent weed invasions
Biological
Insects are being utilized as a means
for long-term management of r+eeds. !n
Colorado, inserts have keen released
on an experimental basis to control
knapweed. At this time, they are not
available to the yener•al public.
Mechanical
Mowing will not kill the plant but
will lessen the visuai impart. In
addition, reduced veyetalive maltrv-
from mowing will allow herbicide use
to be more effective.

,sir

Chemical ~. .. •, .,
Because of their shorter life cycle
diffuse~and:spotted,knapweed can be
effectively treated with herbicides
All herbicide treatments should be
applied at-the rosette stage of the
plant. Generally,, herbicide
applications would be in eart~rii
or fall.'
~..
- Tor•dorr^ at 1 pint/acre
OR ' .
- 2, 4-D ll quart) mixed with Banvel
(1 pint/acre)
OR
- Banvel l1 1/2 quarts] mixed with
2, 4-U lI pint/acre)
r Tordon is a restricted use pestici
and a certified pesticide app ator
license is required to porch
apply this chemical.

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