glyphosate (numerous product names)
Rate Consult labels
Time Apply 1 to 4 weeks before planting to allow time for chemical to move completely into the roots of actively growing weeds.
Remarks Use lower rates for annual weeds; consult label for higher rates and application time for perennial weeds. Additional surfactant sometimes is helpful when weeds are less vigorous. Inhibits production of three amino acids and protein synthesis.
Caution If repeat treatments are necessary within the crop, do not exceed 10.6 lb ai/a (10.6 quarts/a) in 1 year.
Site of action Group 9: inhibits EPSP synthase
Chemical family None generally accepted
See the current edition of the PNW Plant Disease Management Handbook for application details and list of approved materials. Recently, a number of changes have been made on labels regarding new mitigation measures for soil fumigants including:
- Restricted Use Pesticide classification for metam sodium and dazomet
- New mandatory Good Agricultural Practices (GAPs)
- Application rate reductions
- Buffer zones requirements
More information from ODA: http://oregon.gov/ODA/PEST/docs/pdf/soilfumigation.pd