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Presented by Mohamed ELIMEM ; Brahim CHERMITI

International Symposium « Crop Protection Management in Mediterranean Organic Agriculture » May 14 -16, 2013 Sousse ( Tunisia ).

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Presented by Mohamed ELIMEM ; Brahim CHERMITI

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  1. International Symposium « Crop Protection Management in Mediterranean OrganicAgriculture » May 14 -16, 2013 Sousse (Tunisia) Comparison between OriuslaevigatusFieber (Hemiptera; Anthocorridae) imported and local strains efficacy to control FrankliniellaoccidentalisPergande (Thysanoptera; Thripidae) in protected pepper crop greenhouses in Tunisia. Presented by Mohamed ELIMEM; Brahim CHERMITI Laboratoire d’entomologie et de lutte biologique, Institut Supérieur Agronomique de Chott-Mériem (ISA CM). B.P. 47, 4042, Université de Sousse (Tunisia).

  2. Introduction

  3. FrankliniellaoccidentalisPergande (1895) (Thysanoptera : Thripidae) ClassInsecta OrderThysanoptera Sub-orderTerebrantia FamilyThripidae

  4. Biological cycle of F. occidentalis

  5. F. occidentalisDamages Direct Damages Indirect Damages Tospoviruses TSWV INSV

  6. F. occidentalisControl

  7. Predators

  8. Aims 2 1 Valorization of the local strains of the predator to control the WFT 3 Evaluation of thrips predatorimportedstraineffeciency Comparaison betweenbothstrains 10

  9. Materiel and methods

  10. Geographiclocalization of the experimental sites

  11. Sampling Six experimental greenhouses : three in the Agricultural Support Station of Nebhana in the region of Monastir and three in the region of Bekalta. Area of 500 m² . Four rows that each of which is formed by two lines of pepper. Each line was divided into eight blocks. From each block one pepper plant was randomly chosen and three flowers were taken from the different strata making thus a total number of 96 flowers per greenhouse.

  12. Collect of the local strain of O. laevigatus Flowers of Chrysanthemum coronariumthat were growing in an uncultivated field in the High Institute of Agronomy of Chott-Mériem.

  13. Importedstrain of O. laevigatus Koppert®Netherland

  14. Releases of O. laevigatus

  15. Results and discussion

  16. Effeciency of O. laevigatusimportedstrain

  17. Greenhouse control F. occidentalispopulation monitoring

  18. Greenhouse G1 WFT began to decrease seven weeks after the 1st release (three weeks after predator apparition). O. laevigatusappeared four weeks after 1st release Population monitoring of F. occidentalisand O. laevigatus First individuals of O. laevigatusthatappeared in the greenhouse are larvae. Adultsappearedthreeweekslater. Population monitoring of O. laevigatus

  19. Greenhouse G2 WFT began to decreasesevenweeksafter the 1st release (twoweeksafterpredatorapparation). O. laevigatusappeared five weeksafter 1st release Population monitoring of F. occidentalisand O. laevigatus First individuals of O. laevigatusthatappeared in the greenhouse are larvae. Adultsappearedtwoweeklater. Population monitoring of O. laevigatus

  20. O. laevigatusimportedstraincan not beestablished in the greenhouse. However, releasedadultslayeggs and desappear. After a whilelarvaebegin to appear and laterpredator population proliferatecausingthus WFT population decrease.

  21. Effeciency of O. laevigatuslocal strain

  22. Identification of the predator Only one speciesthatwasentcounteredaccording to Péricart (1972) OriuslaevigatusFieber (1860) (Hemiptera; Anthocoridae) Male Genitalia Female’s copulator tube

  23. Greenhouse control F. occidentalispopulation monitoring

  24. Greenhouse G1 WFT began to decrease one weekafter the 1st release. O. laevigatusappeared one weeksafter 1st release Population monitoring of F. occidentalisand O. laevigatus First individuals of O. laevigatusthatappeared in the greenhouse are adults. Larvaeappearedtwoweekslater. Population monitoring of O. laevigatus

  25. Greenhouse G2 WFT began to decreasetwoweeksafter the 1st release. O. laevigatusappeared one weeksafter 1st release Population monitoring of F. occidentalisand O. laevigatus First individuals of O. laevigatusthatappeared in the greenhouse are adults. Larvaeappearedtwoweeklater. Population monitoring of O. laevigatus

  26. O. laevigatuslocal strainis able to beestablished in the greenhouse and to proliferate. It can cause WFT population decrease in one to twoweeks.

  27. Valorization of the local strain in an IPM program to control WFTin peppercropgreenhouses Conclusion • O. laevigatusimportedstraincan not beestablished in the greenhouse but itseffect on thrips population canbeshownlater.

  28. Thankyou for your attention !!

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