Thèse de doctorat en Entomologie
Sous la direction de Claude Alauzet.
Soutenue en 2004
à Toulouse 3 .
Pas de résumé disponible.
Screening of a strain of Trichogramma (Hymenoptera : Trichogrammidae) to control Plutella xylostella (Lepidoptera : Plutellidae)
Our research program aimed to select the parasitoid the best adapted to control the diamondback moth in cauliflower greenhouses. First, we compared, in the laboratory, the parasitic efficacy of thirty, indigenous and exotics, Trichogrammatidae strains on P. Xylostella eggs, and in parallel, on Ephestia kuehniella Zeller eggs (Lepidoptera: Pyralidae) in glass tubes. The sixteen best strains (parasitizing more than 30% of P. Xylostella eggs) together with two indigenous strains were tested in a greenhouse, on cauliflowers infested by P. Xylostella eggs. Nine strains parasitized more than 60% of P. Xylostella eggs. The biological potential of these strains (fecundity, offspring emergence and offspring sex-ratio, mortality) was determined in laboratory and their dispersal was measured in greenhouse. For all considered factors, the best biological potential was obtained for strain T. Cheloni, T. Evanescens and T. Ostriniae.