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Chamaesphecia doryliformis [Lep.: Sesiidae], a second root borer for the control ofRumex spp. [Polygonaceae] in Australia

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Abstract

The host-specificity and biology ofChamaesphecia doryliformis (Ochsenheimer) [Lep.: Sesiidae] are described and the insect is assessed for its potential as a biological control agent for weeds of the genusRumex (Polygonaceae) in Australia. The insect is found in the western Mediterranean region, chiefly in north Africa. Adults emerge from pupation in late spring to summer when they lay eggs. The larvae feed inside the roots of post-reproductive plants belonging to the subgeneraRumex andAcetosa. In host-specificity tests 1st instar larvae attacked only plants of thePolygonaceae. The insect was judged safe to release in Australia after assessing its level of host-specificity, and attributes of its biology which indicate that native AustralianPolygonaceae will not be endangered.

Résumé

La biologie et la spécificité deChamaesphecia doryliformis (Ochsenheimer) [Lep.: Sesiidae] sont décrites, et l'efficacité potentielle de cet insecte en tant qu'agent de lutte biologique contre les mauvaises herbes du genreRumex (Polygonaceae) en Australie est discutée. L'insecte est localisé dans la partie occidentale du bassin Méditerranéen, principalement en Afrique duNord. Les adultes apparaissent et pondent au printemps. Les larves se développent à l'intérieur des racines des plantes ayant déjà fleuri. Les plantes attaquées appartiennent aux sous-genresRumex etAcetosa. Au cours de tests de spécificité avec des larves du 1er stade, seules des plantes de la famille desPolygonaceae furent l'objet de dégâts. L'insecte fut jugé apte à être introduit en Australie après que l'étude de sa biologie et de sa spécificité eut démontré que lesPolygonaceae endémiques ne seraient pas menacées.

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Scott, J.K., Sagliocco, J.L. Chamaesphecia doryliformis [Lep.: Sesiidae], a second root borer for the control ofRumex spp. [Polygonaceae] in Australia. Entomophaga 36, 245–251 (1991). https://doi.org/10.1007/BF02374560

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