Détail de la référence

Using new egg parasitoids (Trichogramma spp.) to improve integrated management against Tuta absoluta

Auteur : Khanh (H.do Thi)

Année de publication : 2012
Publication : Bulletin OEPP/EPPO Bulletin. Organisation Européenne et Méditerranéenne pour la Protection des Plantes
Volume : 42
Fascicule : 2
Pagination : 249-254

Résumé :

This study is the first step of the TutaPI program (201113) to decrease the costs of Integrated Pest Management (IPM) strategies against Tuta absoluta in France by investigating new beneficial insects. Currently, the association of predator/egg parasitoid (Macrolophus pygmaeus and Trichogramma achaeae, respectively) in IPM - strategies are quite effective, but expensive. Sixty-four new potential strains from 19 Trichogramma species originating from different regions of the world (from the collection of Trichogramma at INRA Provence Alpes Cote d'Azur (PACA), France) were studied in this work. A screening study was performed on T. absoluta eggs on isolated tomato leaves (for 24h at 25[plus or minus]1[degree]C, RH75[plus or minus]5% and 16h light:8h dark). The proportion of parasitized T. absoluta eggs varied greatly (between 0 and 73%) depending on the different strains used. Levels of parasitism by females, equal to or higher than that of T.achaeae, were observed in 14 of the strains tested among eight species (four from France, four from elsewhere in Europe). The proportion of females that parasitized T.absoluta eggs was significantly different between strains (from 0 to 100%). Experimental results allowed about half of the 64 initial strains to be eliminated before the next steps: tests on a larger scale (mesocosm, and then in the greenhouse and field)