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Gratiana evaluation studies St. Lucie Co. 2006/2007

Gratiana evaluation studies St. Lucie Co. 2006/2007. Two methods. TSA demographics (plant density, beetle density, plant performance over time) Insecticide exclusion. Big release. 545 m. Small release. 1640 m. Big control. 764 m. Small control. TSA demographics study.

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Gratiana evaluation studies St. Lucie Co. 2006/2007

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  1. Gratiana evaluation studies St. Lucie Co. 2006/2007

  2. Two methods • TSA demographics (plant density, beetle density, plant performance over time) • Insecticide exclusion

  3. Big release 545 m Small release 1640 m Big control 764 m Small control TSA demographics study • 4 hammock areas selected on ranch in SLC • Gratiana released in two hammocks in July 2006 • Quarterly sampling of 16, 2 m2 quadrates along 4 transects in each hammock

  4. Sampling design in each hammock

  5. Data collection

  6. 1 = 1-5% 2 = 6-24% 3 = 25-50% 4 = 51=75% 5 = > 75% Percent Cover *control hammocks were colonized by Gratiana by second sampling date

  7. Plant density

  8. Plants with fruit

  9. July 2006 Oct 2007

  10. July 06 Oct 07

  11. July 06 Oct 07

  12. July 06 Oct 07

  13. Insecticide exclusion study • two locations; IRREC and Buzz Eaves Ranch • imidichlorprid (1ml in 4 oz. H2O) used as soil drench for control plants • plants inspected monthly • parameters measured • basal stem diameter • plant height • cover • number of fruit • feeding damage • numbers of Gratiana

  14. Insecticide efficacy -IRREC

  15. Effect on plant performance - IRREC

  16. Plant survival - IRREC

  17. Insecticide efficacy - Eaves

  18. Effect on plant performance - Eaves

  19. Plant survival - Eaves

  20. Conclusions • Plant population dynamics • study design working well except for controls • effects of G. boliviana evident after one year • study will continue at least one more year • Insecticide exclusion • imidichloprid worked well to exclude Gratiana • lousy design: should not follow individual plants • insecticide exclusion may work in large plots to follow TSA demographics, but there is a possible concern about migration from untreated to treated plots

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