Ferrero et al. Euraac 2008

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Ferrero M, Kreiter S & Tixier M-S (2008). Ability of Phytoseiulus longipes to control spider mite pests on tomato in European greenhouses. Integrative Acarology, Proceedings of the 6th EURAAC, 461-468. 21-25th July 2008, Montpellier (France).

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Ferrero et al. Euraac 2008

  1. 1. Ability of Phytoseiulus longipes to control spider mite pests in European tomato greenhouses Maxime FERRERO, Serge KREITER, Marie-Stéphane TIXIER 6 th Symposium of European Association of Acarologists Montpellier 21-25th July 2008 Montpellier SupAgro UMR CBGP 1062, équipe acariens 2 Place Pierre Viala, 34060 Montpellier Cedex 01, France
  2. 2. Summary <ul><li>Project presentation </li></ul><ul><li>Life history of the Chilean strain of P. longipes at several prey/ plant conditions </li></ul><ul><ul><li>Material and Methods </li></ul></ul><ul><ul><li>Results </li></ul></ul><ul><li>Conclusions & perspectives </li></ul><ul><li>Other experiments done or on the way … </li></ul>
  3. 3. Tetranychus evansi Baker &Pritchard <ul><li>Tomato : first produced vegetable in Europe (EU 27) </li></ul><ul><li>Key pests of tomato crops </li></ul><ul><ul><li>Resistant to acaricides </li></ul></ul><ul><ul><li>No effective biocontrol found </li></ul></ul>Project presentation (1/2) A new solution is needed Tetranychus urticae Koch
  4. 4. Project presentation (2/2) Phytoseiulus longipes Evans <ul><li>SA . South Africa (Badii; Takahashi et Chant) </li></ul><ul><li>B . Brazil (Furtado; Ferrero) </li></ul><ul><li>C . Chile (Ferrero) </li></ul><ul><li>A . Argentina (Ferrero) </li></ul>P. persimilis P. macropilis P. fragariae Phytoseiulus
  5. 5. Life history of the Chilean strain of P. longipes at several prey/ plant conditions <ul><li>OBJECTIVES </li></ul><ul><li>Ecological and biological description </li></ul><ul><li>Plant and prey suitability </li></ul><ul><li>Potential for being a biological agent </li></ul>
  6. 6. Material and Methods <ul><li>Observations </li></ul><ul><li>Immature stages durations </li></ul><ul><li>Adult phases durations </li></ul><ul><li>Calculations </li></ul><ul><li>Demographic parameters </li></ul>
  7. 7. Results : Immature phases development <ul><li>Plant/ prey conditions do not have significative influence on development durations </li></ul><ul><li>High mortality on T. evansi / tomato and almost none for the other conditions </li></ul><ul><li>Impossible to rear our strain of T. evansi on bean </li></ul><ul><li>no data </li></ul>
  8. 8. Results : intrinsic rate of natural increase of some Phytoseiulus species on Solanaceae P. longipes C unable to control T. evansi nor T. urticae populations on Solanaceae, but P. longipes B could ! T. evansi r m on tomato (Bonato et al. 1999) r m T. urticae r m on tomato (Castagnoli et al. 2003) 0 0,05 0,1 0,15 0,2 0,25 0,3 P. longipes B P. longipes C P. fragariae T. evansi T. urticae
  9. 9. Results : Intrinsic rate of natural increase of some Phytoseiulus species on « Beans » r m T. urticae r m on bean (van Impe 1985) Remark results on T. evansi / bean with adapted strains ? Conclusion all strains tested of P. longipes could have similar efficiency than P. persimilis on T. urticae on non Solanaceae plants
  10. 10. Conclusions & perspectives 1. P. longipes C is not a candidate for being a biological agent on tomato crops BUT A rgentinean and B razilian strains could be ! 2. All strains of P. longipes have the potential to be biological control agents of T. urticae on other crops !
  11. 11. Other experiments done or on the way … <ul><li>Egg resistance to low humidities: key point in tomato greenhouses </li></ul><ul><li>Feeding preference tests: which one of the two preys P. longipes A will eat preferentially when put in a greenhouse were both could be present ? </li></ul>Petri dish Leaf disks « Bridge » Humidified cotton 1 2
  12. 12. Other experiments done or on the way … <ul><li>Field experiment : actual efficacy of the Argentinean strain on T. evansi and T. urticae </li></ul>
  13. 13. Thanks for attention ! 6 th Symposium of European Association of Acarologists

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