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What Are Those
...and what to do about them.
Click on "More information" for a
UNR Cooperative Extension Weed Wanted Poster with more information
including how to eradicate these weeds.
Some weeds have the official
designation "Noxious Weed" and get special eradication attention.
"Obnoxious Weed" is washoevalley.org's designation for those other
pesky weeds we find in our yards.
The weeds below are just a few of the ones
attacking Washoe Valley. See these links for more:
UNR Cooperative Extension Wanted Posters
Extension except where noted.
click on the each photo for
a larger one
|Tall whitetop, or perennial
pepperweed, is a native of
southern Europe and western
Asia. It has naturalized in many parts of the United States,
including Nevada. Many western states have declared it a noxious
weed. This perennial grows in
waste places, wet areas, ditches,
roadsides, and croplands, including alfalfa fields. It is a problem
in hay bales because it does not cure. The robust,
spreading roots and numerous seeds make control difficult to
impossible. Mechanical measures such as disking or mowing spread the
plant. Chemical control treatments must be timed
properly and applied only after last season’s debris is removed or
the effort is wasted. Tall whitetop is listed as a noxious weed by
Nevada Administrative Code.
|Puncturevine an annual, forms
a mat 1 to 10 feet in diameter.
Introduced from southern
Europe, it has spread throughout the United States in waste areas,
along roads, and in pastures and fields. The seeds are found in
hard, spiny burs that can penetrate skin, bicycle tires, and even
sidewalls of auto tires. These spiny burs are harmful
to livestock, are objectionable in
hay, and reduce the quality of wool fleece. Yellow flower appears
from July to October. The spiny bur develops shortly afterwards.
Puncturevine is a noxious weed by the Nevada Administrative Code.
|Yellow starthistle is a
weed that dominates rangelands, roadsides,
and fields primarily in Oregon, Washington, California, and Idaho.
It is found scattered throughout the
rest of the U.S. In Nevada, it can dominate rangeland that receives
less than 15 inches of annual precipitation.
It completely changes the natural habitat it invades. The
injurious nature of its vicious spines negatively impacts
recreationists, livestock, and wildlife. It is poisonous
to horses, causing a nervous disorder called “chewing disease” when
they are forced to eat it. Yellow starthistle is listed as a noxious
weed by Nevada Administrative Code.
|Bur Buttercup, an "Obnoxious Weed"
is invading bare areas all over Washoe Valley (2006). This weed will
produce a dry bur which will stick your dogs feet, tangle in their
hair and stick you when you try to remove it.
Bur buttercup (Ranunculus
testiculatus) is an exotic annual weed, native of southeastern
Europe that has become widespread in gardens, small grains,
pastures, wastes areas, and along roadsides in the western USA. It
is a winter annual that emerges, flowers, and sets fruits in the
spring, when temperatures climb into the 45 to 50-degree range. It
is a toxic species because it contains ranunculin, a chemical that
changes into to protoanemonin, a highly toxic compound. The
transformation of ranunculin into protoanemonin occurs when the
plant is crushed. There are reports of sheep poisoning after
ingesting bur buttercup.
It is important to control bur buttercup before they produce
flowers and seeds. Hoeing, pulling and digging can control bur
buttercup. So early, early spring is the time to get these guys.
info on bur buttercup and other winter
|More weeds will be added soon. Have a weed you want
identified? Send in a clear photo.