United States Department of Transportation
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Enhanced biological control of yellow starthistle and tumbleweed (Russian thistle).
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2006-07-01
[PDF-871.41 KB]
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Abstract:Yellow starthistle and tumbleweed (Russian thistle) are two of the most important weeds on California Department of Transportation
(Caltrans) rights-of-way. They occur in high densities, out-competing desirable grasses and increasing risk of wildfire and soil erosion.
Transportation rights-of-way serve as corridors that can aid the spread of weed seeds by vehicles. Weed-infested rights-of-way can also be a
source of seeds that might contribute to the spread of weeds to neighboring properties. Both these plants are alien to North America and have
previously been targeted for biological control, but the introduced agents have not reduced these weeds in California. Release of new agents
can provide widespread and perpetual reduction of weed populations without further expenditures.
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