Interactions between an eucoilid [Hymenoptera] and a staphylinid [Coleoptera] parasitoid of the cabbage root fly

Reader, P. M.; Jones, T. Hefin

doi:10.1007/bf02374799

Cited by 18 publications

(13 citation statements)

References 9 publications

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“…Both Aleochara species were able to parasitise successfully D. radicum pupae already parasitised by the hymenopteran endoparasitoid T. rapae (Reader & Jones, 1990). Both Aleochara species were able to parasitise successfully D. radicum pupae already parasitised by the hymenopteran endoparasitoid T. rapae (Reader & Jones, 1990).…”

Section: Discussionmentioning

confidence: 98%

Life history comparison between two competitive Aleochara species in the cabbage root fly, Delia radicum: implications for their use in biological control

Fournet¹,

Stapel²,

Kacem³

et al. 2000

Entomologia Exp Applicata

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This study evaluates the efficacy of Aleochara bilineata Gyll and Aleochara bipustulata L. (Coleoptera: Staphylinidae) as biological control agents against the cabbage root fly, Delia radicum L. (Diptera: Anthomyiidae). Biological and demographic characters are documented and comparisons made between the two species. The following results were obtained:(1) The reproductive potential and longevity of A. bipustulata females are significantly higher than those of A. bilineata. These differences are correlated with the biology and ecology of the hosts of both species.(2) Under laboratory conditions the rate of increase (r m ) of both staphylinids species is significantly higher than that of the pest and their major competitor Trybliographa rapae West. (Hymenoptera:Figitidae). This may indicate that A. bilineata and A. bipustulata can be effective biological control agents.(3) Aleochara bilineata appears to be the most interesting biological control agent against D. radicum, because of its higher rate of increase, higher host specificity and host acceptance, and a development time which is well synchronised with that of its host. With its higher competitive ability, a population of A. bilineata may increase even if competition occurs. However, A. bipustulata presents interesting biocontrol characteristics, but the best strategy may be only to use the potential of its natural populations.

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Section: Discussionmentioning

confidence: 98%

Life history comparison between two competitive Aleochara species in the cabbage root fly, Delia radicum: implications for their use in biological control

Fournet¹,

Stapel²,

Kacem³

et al. 2000

Entomologia Exp Applicata

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“…This included puparia with decayed contents following unsuccessful parasitism by A. bilineata, e.g. caused by parasitism by T. rapae prior to the attack by A. bilineata (Reader & Jones, 1990). Sorting of pupae was done in late winter, when most pupae parasitized by T. rapae could be recognized by their smaller size and, in the parasitoid's ectoparasitic stages, the presence of dark, granular meconium.…”

Section: Methodsmentioning

confidence: 99%

Insect‐crop interactions in a diversified cropping system: parasitism by Aleochara bilineata and Trybliographa rapae of the cabbage root fly, Delia radicum, on cabbage in the presence of white clover

Langer

1996

Entomologia Exp Applicata

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Parasitism of the cabbage root fly, Delia radicum (L.) by the staphylinid Aleochara bilineata Gyllenhal and the cynipid Trybliographa rapae Westwood was examined in a cabbage monoculture and a mixed stand of cabbage undersown with white clover. Number of overwintering cabbage root fly pupae per plant was consistently reduced in the mixed stand, and the incidence of plants attacked by cabbage root fly was either reduced or not different in the mixed stand compared to cabbage monoculture. For both parasitoids, the probability of D. radicum attacked plants having at least one parasitized pupa increased with density of cabbage root fly pupae around the plant. For A. bilineata, this positive relation between presence of parasitism and host density was consistently stronger in cabbage monoculture than in cabbage undersown with clover. Location of a host plant by T. rapae was not consistently affected by the presence of clover. D. radicum attacked plants situated in the cabbage and clover mixture were found by T. rapae as easily as in cabbage monoculture. Overall, the ‘total risk of parasitism’ for a cabbage root fly pupa by A. bilineata was reduced in the mixed stand compared to the cabbage monoculture, whereas the risk of parasitism by T. rapae was not consistently affected by clover. For both parasitoids, intensity of parasitism showed a variable relationship with host density on individual plants attacked by the cabbage root fly. Overall, in spite of consistently lower total density of pupae in the mixed cabbage – clover than in cabbage monoculture, the density of unparasitized pupae was reduced by the presence of non‐host plants only in two of the four experiments. The results emphasize the need to include not only herbivore and crop, but also other plant species as well as natural enemies when evaluating management methods.

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“…). Although bothBromand (1980) andReader & Jones (1990) have observed multiparasitism to occur, For example, of 300 pupae examined in November 1989, 35 (11.7%) had been parasitized by T. rapae, 108 (36%) by A. bilineata, with the remaining 52*3% being healthy.…”

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confidence: 98%

Spatial Heterogeneity and the Population Dynamics of a Host--Parasitoid System

Jones

Hassell

Pacala

1993

The Journal of Animal Ecology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. British Ecological Society is collaborating with JSTOR to digitize, preserve and extend access to Journal of Animal Ecology. Summary 1. The cabbage root fly, Delia radicum, at Silwood Park is attacked by both generalist and specialist natural enemies. This paper uses spatial and temporal census data to examine the relative contributions of these natural enemies to the population dynamics of D. radicum. 2. Data on the distributions and mortalities of D. radicum on 40 swede plants in nine consecutive years have been analysed. Using a maximum likelihood technique, the parameters (together with their support limits) have been estimated from these data for a model of an insect host-generalist-specialist interaction. Three particular cases of the model are analysed: (i) only the generalist, Aleochara bilineata, is present; (ii) only the specialist, Trybliographa rapae, is present; and (iii) both species of natural enemy are present. 4. The study points to an interesting interplay between the different natural enemy species. (i) T. rapae can promote stability by virtue of its spatial response to host density, but only within a very narrow range of values of the host's rate of increase. (ii) A. bilineata acts as a simple, between-generation density-dependent factor and thus, in a straightforward way, tends to regulate the host population. (iii)When the two enemies act together a further property appears, provided that the survivorship of T. rapae is sufficiently high; the interplay of the two natural enemies can now lead to alternative, three-species stable states.

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Interactions between an eucoilid [Hymenoptera] and a staphylinid [Coleoptera] parasitoid of the cabbage root fly

Cited by 18 publications

References 9 publications

Life history comparison between two competitive Aleochara species in the cabbage root fly, Delia radicum: implications for their use in biological control

Life history comparison between two competitive Aleochara species in the cabbage root fly, Delia radicum: implications for their use in biological control

Insect‐crop interactions in a diversified cropping system: parasitism by Aleochara bilineata and Trybliographa rapae of the cabbage root fly, Delia radicum, on cabbage in the presence of white clover

Spatial Heterogeneity and the Population Dynamics of a Host--Parasitoid System

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