Abstract
The egg parasitoid Anagrus nigriventris Girault is an important natural enemy of the beet leafhopper, Circulifer tenellus (Baker) which has a broad host range that includes cultivated sugar beets and the weed, Russian thistle. When parasitoids were reared on leafhopper eggs deposited in sugar beets, females were attracted to sugar beet volatiles and preferred them over a blank control and over Russian thistle volatiles in Y- tube olfactometer tests. No preference was detected for either plant by female wasps that were reared on Russian thistle. Wasps reared on Russian thistle and allowed an oviposition experience on sugar beet showed a strong attraction to sugar beet volatiles; however, wasps reared on sugar beets and allowed oviposition experience on Russian thistle demonstrated no preference between the two plants. The implications of parasitoid response towards plant volatiles and their importance in biological control are discussed.
Résumé
Le parasitoÏde oophageAnagrus nigriventris est un ennemi naturel important de la cicadelleCirculifer tenellus qui a une large gamme de plantes hÔtes comprenant aussi bien la betterave sucrière que des plantes sauvages commeSalsola tragus L. Lorsque les parasitoÏdes sont élevés sur des oeufs de cicadelles pondus dans des betteraves sucrières, les femelles sont attirées par les composés volatiles de la betterave et les préfèrent au témoin neutre ou aux composés deSalsola lors des tests en olfactomètre (tube en Y). On ne note aucune préférence pour l’une ou l’autre plante dans le cas de femelles élévées surS. tragus. Ces dernières qui ont une expérience de ponte sur betterave montrent par la suite une forte attraction pour les composés volatiles deS. tragus; cependant les parasitoÏdes élevés sur betterave et qui font l’expérience de ponte surS. tragus ne montrent aucune préférence entre les deux plantes. Les implications des réponses de ces parasitoÏdes vis-à-vis des composés volatiles issus de plantes et leur importance dans la lutte biologique sont discutées.
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Honda, J.Y., Walker, G.P. Olfactory response of Anagrus, nigriventrls (HYM.: Mymaridae): Effects of host plant chemical cues mediated by rearing and oviposition experience. Entomophaga 41, 3–13 (1996). https://doi.org/10.1007/BF02893287
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DOI: https://doi.org/10.1007/BF02893287