THE USE OF WEED FEEDING INSECTS FOR THE NON-CHEMICAL MANAGEMENT OF PUNCTUREVINE ALONG CALIFORNIA HIGHWAYS
A brief history of puncturevine's introduction, taxonomic position, origin, spread and economic importance in California is given. The foreign exploration, testing, and introduction of the seed and stem weevils (Microlarinus spp.) of puncturevine in California are reviewed. A total of 4,831 weevils were collected and transferred to problem areas along California highways. Plant damage studies were carried out in which it was shown that weevil feeding caused significant differences in seed pod production, stem length, and plant dry weight in a closed system experiment. In an open system experiment, significant seed pod destruction occurred although the plants had received excessive water. Preliminary studies showed that weevils respond to water and methanol-soluble extracts of puncturevine.
- Report on Biological Control of Russian Thistle and Puncturevine along California Highways. The report number for Phase A is FHWA-CA-HM-USDA-4108-78-01.
Agricultural Research ServiceBiological Control of Weeds Lab
Albany, CA USA
Washington, DC USA 20590
- Maddox, D M
- Publication Date: 1977-7
- Pagination: 23 p.
- TRT Terms: Field tests; Highways; Insects; Loss and damage; Plant growth; Roadside; Seeds; Weed control
- Geographic Terms: California
- Subject Areas: Highways; Maintenance and Preservation;
- Accession Number: 00180827
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: Final Rpt.
- Files: NTIS, TRIS, USDOT
- Created Date: Sep 14 1978 12:00AM