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Infectivity of entomopathogenic nematodes (Steinernematidae, Heterorhabditidae) to mushroom phorid fly (Megaselia halterata) larvae

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For more content, see Nematologica.

Ten isolates of entomopathogenic nematodes were screened for infectivity to phorid larvae in beakers of spawned mushroom compost. The sex ratio of emerging flies was unaffected by nematode application. Compared to untreated controls, three isolates (Steinernema D1, Steinernema C1 and S. feltiae A2) reduced phorid numbers. These isolates were tested further at two dose rates (50 000 and 100 000 infective juveniles per beaker) and three fly densities. Compared to the untreated control, all isolates reduced the numbers of flies emerging from the compost; there was a positive dose response but no significant differences between isolates. The nematodes were also bioassayed at three dose rates (100, 200 and 400 infective juveniles per dish) against individual phorid larvae, in dishes of agar containing mushroom mycelium. LD50 values indicated no significant differences in pathogenicity between the isolates.

Le pouvoir infestant de nématodes entomopathogènes (Steinernematidae, Heterorhabditidae) envers les larves de la mouche phoride des champignons (Megaselia halterata) - Dix isolats de nématodes entomopathogènes ont été testés pour leur pouvoir infestant envers des larves de phorides dans des béchers contenant du compost avec du blanc de champignon. Le quotient sexuel des mouches émergentes n'est pas affecté par la présence du nématode. En comparaison avec un témoin non traité, trois isolats (Steinernema D1, Steinernema C1 et S. feltiae A2) réduisent le nombre de phorides. Ces isolats ont été ensuite testés à deux doses (50 000 et 100 000 juvéniles infestants par bécher) et trois densités de mouches: en comparaison du témoin non traité, tous les isolats réduisent le nombre de mouches émergeant du compost; si la dose influe sur les résultats, il n'y a pas de différence significative entre les isolats. Les nématodes ont été testés à trois doses (100, 200 et 400 juvéniles infestants par récipient) envers une seule larve de phoride, sur agar contenant du mycelium de champignon. La valeur LD50 n'indique aucune différence significative entre les isolats en ce qui concerne leur pouvoir pathogène.

Affiliations: 1: Department of Entomological Sciences, Horticulture Research International, Wellesbourne, Warwick CV35 9EF,UK; 2: Biometrics Department, Horticulture Research International, Wellesbourne, Warwick CV35 9EF,UK


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