BIOLOGICAL CONTROL OF RUSSIAN THISTLE ALONG CALIFORNIA HIGHWAYS
The objective of this research project was to develop a program to control Russian thistle with insects. Recent records indicate control and clean-up operations against Russian thistle cost Caltrans approximately 1.5 million dollars annually. To date, two species of moths have been released and are established on the plant. Coleophora parthenica, whose larvae feed inside the stems was first released in 1973 and is now widely established. High larval populations are causing stunting and reduced seed production by the plants in some areas. This program has reached the operational stage, and a large scale redistribution program was conducted with this moth during 1977-78. The second moth, Colephora klimeschiella, whose larvae attack the foliage was released in 1977. It is well established in the field, but populations are still too small to allow for large scale redistribution. This moth should work better in cooler areas, where C. parthenica appears to be of limited value. /FHWA/
- This study was conducted in cooperation with the Federal Highway Administration. Study Title: "Biological Control of Russian Thistle and Puncturevine Along California Highways". Part I of the Final Report was dated July 1977.
Department of AgricultureBiological Control of Weeds Laboratory, 1050 San Pablo Ave
Albany, CA USA 94706
- Hawkes, R B
- Publication Date: 1978-7
- Pagination: 26 p.
- TRT Terms: Biological control; Costs; Highways; Insects; Roadside
- Subject Areas: Finance; Highways; Maintenance and Preservation;
- Accession Number: 00196243
- Record Type: Publication
- Source Agency: Federal Highway Administration
- Report/Paper Numbers: FHWA-CA-78-1 Final Rpt.
- Contract Numbers: G-2-11
- Files: TRIS, USDOT
- Created Date: Sep 15 1979 12:00AM