Carbaryl Monitoring in Glassy-Winged Sharpshooter Treatment Areas, Chico - PowerPoint PPT Presentation

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Carbaryl Monitoring in Glassy-Winged Sharpshooter Treatment Areas, Chico
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Carbaryl Monitoring in Glassy-Winged Sharpshooter Treatment Areas, Chico

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  1. Carbaryl Monitoring in Glassy-Winged Sharpshooter Treatment Areas, Chico Johanna Walters and Kean S. Goh Department of Pesticide Regulation GWSS Public Information Meeting February 15, 2001 Chico

  2. Outline • Introduction • Monitoring Objectives • Sampling Sites • Sampling Methods • Results and Conclusions

  3. Introduction • Department of Pesticide Regulation • Independent monitoring • Consultation • Environmental data • Urban environment

  4. Monitoring Objectives Obtain data on environmental concentration of Carbaryl to ensure • human safety • ecological safety • proper application

  5. Sampling Sites Selection Criteria • Sensitive areas • human & ecological • Worst-case monitoring • proximity to application • highest amount used • Highest frequency

  6. Sampling Sites

  7. Environmental Media • Tank Mixture • Air • Surface Water • Ground Water • Foliage • Fruits and Vegetables • Fish

  8. Carbaryl Application

  9. Tank Mixture

  10. Air Monitoring

  11. Water Sampling

  12. Results: Tank Mixture Location Date Sampled Concentration % _________________________________________ Whitman Ave11/5/00 0.142 Chico Mall “ 0.151 __________________________________________________________________________________________________ Label rate ranged 0.05 to 0.20%

  13. Results: Air • Whitman Ave • Four Intervals • 1 hour before • Duration of application plus 1 hour • 24 hours after • Another 24 hours • No residue detected • Health level 3,057 ppt

  14. Results: Foliar Safe levels: 5.6 ug/cm2

  15. Results: Surface Water • Sites • Little Chico Creek • Comanche Creek • Sampling dates • Prespray November 4, • Postspray November 5, • First Rain Event November 13 • No Carbaryl detected Minimum Detection Level 0.05 ppb

  16. Acknowledgments Consultants CDFG, NMFS, RWQCB, Co.Dept. of Ag. CDFA Collaborators Property Owners, Applicators Center for Analytical Chemistry C Cooper, J Hsu, J White, J Hernandez, H Feng, P Lee, D Tran DPR Field Staff Dave Kim, Dee Jones, Nina Bacey