Search results for "Trichogramma evanescens"
showing 3 items of 3 documents
Attraction of Trichogramma Wasps to Butterfly Oviposition-Induced Plant Volatiles Depends on Brassica Species, Wasp Strain and Leaf Necrosis
2021
Within the Brassicaceae, wild as well as crop species are challenged by specialist herbivores including cabbage white butterflies (Pieris spp.). The wild crucifer Brassica nigra responds to oviposition by Pieris butterflies by the synergistic expression of two egg-killing traits. Genotypes that express a hypersensitive response (HR)-like necrosis (direct egg-killing) also emit oviposition-induced plant volatiles (OIPVs) attracting Trichogramma egg parasitoids (indirect egg-killing). This so-called double defense line can result in high butterfly egg mortalities. It remains unknown whether this strategy is unique to B. nigra or more common in Brassica species. To test this, we examined the r…
Intérêts du phénotypage de la personnalité pour améliorer la lutte biologique : cas d’étude chez l’auxiliaire Trichogramma evanescens
2021
One promising approach to improve the use of biological control agents (BCA) consists in the exploitation of intraspecific variation on traits related to mass-rearing or field performance. Consistent inter-individual variations in behaviour (known as personality) have never been considered in biological control (BC) while they have proved to be heritable and correlated to phenotypic traits possibly related to fitness in rearing or field conditions. The aim of this PhD thesis was (i) to develop an experimental design to measure personality traits in a the egg-parasitoid Trichogramma evanescens, and (ii) to evaluate the feasibility and interest of phenotyping personality traits to set and imp…
Host plant cultivar of the grapevine moth Lobesia botrana affects the life history traits of an egg parasitoid.
2009
6 pages; International audience; The quality and susceptibility of insect eggs for egg parasitoids may be affected by the diet experienced by the females that produce the host eggs. We tested the hypothesis that the host plant fed upon by an herbivore during the larval stages will determine the quality of the eggs laid by the adult for an egg parasitoid. We used the tritrophic system comprising five grape cultivars, the European grapevine moth, Lobesia botrana and the parasitoid Trichogramma evanescens. Parasitoid performance in host eggs of different sizes and originating from five grape cultivars was determined. Overall, egg parasitism was higher on cultivars on which L. botrana laid larg…