|
Coarsegold Resource Conservation District |
|
YELLOW STARTHISTLE ERADICATION AND CONTROL PROGRAM |
|
COARSEGOLD RESOURCE CONSERVATION DISTRICT Dear
Eastern Madera County Property Owner: Madera
County and the Coarsegold RCD have recently been mapping the extent of
yellow starthistle, a noxious weed, along Madera County roads and
community service areas (under no circumstances have our mapping staff
entered private property without permission).
Our maps indicate that yellow starthistle has been observed on your
property, or on that of one of your neighbors. Yellow
starthistle is a noxious weed that reduces the value of real estate,
degrades recreational areas, and replaces desirable plants used by
livestock and wildlife, rendering land useless for forage and habitat.
This weed is also highly toxic to horses, causing a fatal nervous
system disease when large quantities are ingested.
Although other areas of California are infested with yellow
starthistle so badly that its eradication is impossible, our mountain area
is still in the initial stages of infestation, and we feel that with
prompt action, we can keep this pest from impacting private and public
lands in eastern Madera County. The
Coarsegold RCD is sponsoring a cooperative approach to controlling this
weed, whereby the cost of treatment is shared with property owners.
The program requires the landowner to commit to three consecutive
years of treatment; because the seed of yellow starthistle is viable for
at least 3 years as CRCD grant funds permit, and then to commit to follow
up by pulling any stragglers that emerge in subsequent years (the
objective is to prevent seed production until the plants are gone from the
site).
The cost share program involves the landowner paying 50 % and
the RCD paying 50 %. We are
working to make eradication of yellow starthistle in Madera County a
community-wide effort, and encourage you to join with your neighbors in
eliminating this noxious pest. The
method of controlling yellow starthistle is to use an integrated
management approach, combining several different control methods as
dictated by the conditions at the site.
Table 1 shows the options available. If
you’d like to participate in the program, complete the accompanying
participation agreement and call the number given to get a free estimate
of the cost. Please
feel free to call me at 877-3774 if you have questions about the program. Sincerely, Judy
Johnson, Project Manager METHODS COMMONLY USED TO CONTROL YELLOW STARTHISTLE HAND
PULLING: For small
infestations – up to a thousand plants and less than ½ an acre for
example – hand pulling is desirable and very effective.
Yellow starthistle must be pulled before flowering if plants are to
be left on site to decompose and recycle into the soil.
If flowers are visible, plants need to be bagged in heavy duty
plastic garbage bags (4 ml thickness), tightly sealed, and placed in the
garbage. Hand pulling while
infestations are still small is preferable because if treated promptly,
yellow starthistle can be effectively eradicated without herbicides. WEED
WHACKING OR MOWING: Must
be done when 2-5% of the spiny heads are showing yellow flowers.
This minimizes the chance of seeds forming while also minimizing
resprouting. Should be
followed up with hand-pulling or another treatment 3-4 weeks later. HERBICIDE:
If your infestation is too large to apply the above methods
practically, herbicides may be necessary in addition to hand and
mechanical methods. CRCD is
recommending a low toxicity, highly selective herbicide called Transline
for most applications. Transline
has both post emergent and pre emergent activity so one application per
year is usually sufficient. This
material is in the most benign category of pesticides, requires no permit,
and has no grazing restrictions. It
is selective, affecting a few plant families, but sparing many others,
including grasses and California poppies. Based on research at UC Davis, two to
three consecutive years of spraying with Transline combined with
persistent manual removal of any plants that might escape spraying
will eliminate any source of new seed.
After that, manual removal of the few plants that emerge from seeds
in the soil should be adequate for complete control. CATTLE,
SHEEP AND GOATS: Consult
with your local Cooperative Extension Farm Advisor on timing livestock
grazing to minimize yellow starthistle.
Grazing will need to be combined with other methods to eliminate
stragglers. It
is crucial to realize that some follow up will be necessary for several
years after the primary treatments. Allowing
even one large plant to set seed can set back our efforts dramatically (1
large plant produces tens of thousands of seeds!). |
![]() |
|
************************************************************************************** Assessor’s
Parcel
|