Environmental Entomology (1997) 26, 933-938

Franck Hérard and Geneviève Prévost (1997)
Suitability of Yponomeuta malinellus and Y. cagnagellus (Lepidoptera: Yponomeutidae) as hosts of Diadegma armillata (Hymenoptera: Ichneumonidae)
Environmental Entomology 26 (4), 933-938
Abstract: The ichneumonid Diadegrna armillata (Gravenhorst) is a candidate for biological control of Yponomeuta malinellus Zeller in the Pacific Northwest of the United States. In Europe, the parasitoid attacks several Yponomeuta spp. that develop asynchronically on various host plants. Investigations on host-parasitoid relationships were carried out to assess the potential value of parasitoids obtained from non-Y. malinellus hosts as biological control agents against Y. malinellus. Host acceptance, host suitability and parasitoid encapsulation of D. armillata, attacking Y. malinellus and Y. cagnagellus (Hübner), were studied. Four combinations of the 2 target hosts and parasitoids originating from each were studied. Measurement of rates of infestation, host mortality during development, percentages of dissected host containing either living, or encapsulated parasitoids, and successful rate of parasitism in reared hosts were compared in the 4 combinations. Results demonstrated that there is no absolute barrier to parasitoids from 1 host using the other host. However, D. armillata showed a higher physiological performance against Y. malinellus regardless of its natal Yponomeuta host species. Y. cagnagellus was more resistant than Y. malinellus to attacks from D. armillata, and D. armillata from Y. cagnagellus better overcome host defenses. Therefore, D. armillata individuals from Y. cagnagellus could be used in biological control introductions against Y. malinellus in North America. In fact, it would be preferred over D. armillata from Y. malinellus.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Franck Herard

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Yponomeuta malinellus	Apple (Malus)
	Yponomeuta cagnagella
Diadegma armillata (parasitoid)	Yponomeuta malinellus