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DESCRIPTION:
Russian thistle, a common annual broadleaved weed in the goosefoot
family, is found in saline areas. It occurs throughout the western
states, usually more often in drier areas. The cotyledons and first
true leaves are long and thin, like pine needles. Mature plants
are spherical bushes up to 5 feet (1.5 m) tall. After they turn
grayish brown, the plants break away from the roots at the soil
line, becoming tumbleweeds that scatter their seeds. It is a preferred
host of the beet leafhopper. The common soil-applied herbicides
generally provide good control of this weed, but the seeds germinate
deeper than most, so control may be poor where incorporation is
shallow.
See UC IPM's Russian Thistle
Pest Note for more information.
Broadleaf ID illustration.
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