Use of Hydrellia Flies as Biocontrol Agents for Management of Hydrilla

Use of Hydrellia Flies as Biocontrol Agents for Management of Hydrilla PowerPoint PPT Presentation


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Introduction. Hydrilla verticillata Invasive

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Use of Hydrellia Flies as Biocontrol Agents for Management of Hydrilla

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1. Use of Hydrellia Flies as Biocontrol Agents for Management of Hydrilla Julie Nachtrieb, Michael Grodowitz, Chetta Owens, and Nathan Harms U.S. Army Engineer Research and Development Center (ERDC), Environmental Laboratory, Lewisville, TX

2. Introduction mention fly life cycle and that larvae feed Larval flies feed on up to X leaves during the three instars. mention fly life cycle and that larvae feed Larval flies feed on up to X leaves during the three instars.

3. Photosynthesis

4. Biomass, Turions, and Tubers

5. Hydrilla Biomass

6. Turion Numbers

7. Tuber Numbers

8. Tuber Numbers

9. Fragments Mention field observations that hydrilla with high levels of fly damage might fragment easilyMention field observations that hydrilla with high levels of fly damage might fragment easily

10. Fragments

11. Fragments

12. Mass - rearing Part of the us army engineer research and development center in vicksburg, ms The laerf also includes mesocosms, greenhouses, etcPart of the us army engineer research and development center in vicksburg, ms The laerf also includes mesocosms, greenhouses, etc

13. Mass - rearing

14. Mass - rearing Say at end of slide……Just say increases in fly pops followed by hydrilla declines have been observed at several sitesSay at end of slide……Just say increases in fly pops followed by hydrilla declines have been observed at several sites

15. Sheldon Lake, TX In 2002, ten years later, flies still detected. Pic is from 2004 fly damage and immatures and adult readily seenIn 2002, ten years later, flies still detected. Pic is from 2004 fly damage and immatures and adult readily seen

16. Choke Canyon Reservoir, TX 2004 & 2005 robust hydrilla, topped out, very few signs of fly damage seen including adults or immatures Pic is 2006 flies spreading throughout lake2004 & 2005 robust hydrilla, topped out, very few signs of fly damage seen including adults or immatures Pic is 2006 flies spreading throughout lake

17. Lake Seminole, FL Pic is 2006Pic is 2006

18. Lake Conroe, TX This summer we will monitor monthly and try for early season releases againThis summer we will monitor monthly and try for early season releases again

19. Conclusions

20. Current Research

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