Abstract
Erynniopsis antennata (Rondani), an introduced larval and larval-adult parasitoid of the elm leaf beetle (ELB),Xanthogaleruca luteola (Müller), was found in 11 of 12 northern California cities whereUlmus procera Salisbury andUlmus pumila L. were sampled in 1986 and/or 1987. Maximum apparent parasitism was over 40% in 4 of the cities, but mean parasitism for all sites combined was 4.5%. An introduced pupal parasitoid,Tetrastichus brevistigma Gahan, was found in only 7 cities, with mean and maximum apparent parasitism of 1.2 and 22%, respectively.E. antennata may be of value in managing ELB populations, but more knowledge of its biology and improved sampling methods are required.
Résumé
Erynniopsis antennata (Rondani), parasitoïde larvaire introduit de la galéruque de l'orme,Xanthogaleruca luteola (Müller), a été trouvé dans 11 des 12 villes de Californie du nord où des échantillonnages surUlmus procera Salisbury etUlmus pumilla L. ont été effectués en 1986 et/ou 1987. Le parasitisme apparent maximum fut supérieur à 40 % dans 4 des localités, mais le parasitisme moyen pour l'ensemble des sites fut de 4.5 %. Un parasitoïde des nymphes, également introduit,Tetrastichus brevistigma Gahan, a été trouvé dans 7 villes seulement, avec un taux de parasitisme apparent moyen et maximum de 1.2 et 22 % respectivement.E. antennata peut être utile pour la gestion des populations de galéruques de l'orme, mais une connaissance approfondie de sa biologie et de meilleures méthodes d'échantillonnage sont nécessaires.
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Dreistadt, S.H., Dahlsten, D.L. Distribution and abundance ofErynniopsis antennata [Dipt.: Tachinidae] andTetrastichus brevistigma [Hym.: eulophidae], two introduced elm leaf beetle parasitoids in Northern California. Entomophaga 35, 527–536 (1990). https://doi.org/10.1007/BF02375087
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DOI: https://doi.org/10.1007/BF02375087
Key-words
- insecta
- Xanthogaleruca luteola
- Erynniopsis antennata
- Tetrastichus brevistigma
- Tetrastichus erynniae
- biological control