Host-instar selection in the aphid parasitoid Monoctonus paulensis (Hymenoptera: Braconidae, Aphidiinae): a preference for small pea aphids

Chau, Amanda; Mackauer, M.

doi:10.14411/eje.2000.052

Cited by 48 publications

(46 citation statements)

References 35 publications

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“…This supported previous findings demonstrating that H. axyridis is the most aggressive and better defended species among coccinellid guild (Michaud 2002;Sato et al 2005;Snyder et al 2004;Yasuda et al 2001Yasuda et al , 2004 and that young stages are less defensive than adults against parasitoids (Chau and Mackauer 2000;Gerling et al 1990;Mackauer et al 1996;Walker and Hoy 2003). We demonstrated that H. axyridis could express behavioral defenses not only against predators of the same guild, but also against parasitoids.…”

Section: Host Defenses Occurrence and Effectsupporting

confidence: 93%

Impact of host behavioral defenses on parasitization efficacy of a larval and adult parasitoid

et al. 2010

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Koinobiont parasitoid females when attacking host species are faced with barriers at various levels, host behavioral defenses represent one of these barriers. We present data of the effects of host behavioral defenses on host preference of larval and adult parasitoid. We quantified the effects of defensive behaviors of the exotic host, Harmonia axyridis (Pallas), and the indigenous host, Coleomegilla maculata lengi Timberlake (Coleoptera: Coccinellidae), on the handling time and attack preference of the indigenous parasitoid, Dinocampus coccinellae Schrank (Hymenoptera: Braconidae). Successful egg development was also recorded as a consequence of host behavioral defense and unsuitability. Female parasitoids were offered in an interspecific choice test, adult or larvae of both H. axyridis and C. maculata, and in an intraspecific choice test, larval and adult stage of H. axyridis. Adult H. axyridis exhibited a greater number of defensive behaviors compared to adult C. maculata or larval H. axyridis resulting in significantly longer handling time by the parasitoid. Our results suggest that host acceptance cues used by the generalist parasitoid D. coccinellae are inadequate to evaluate adult H. axyridis. These results provide support to the hypothesis that H. axyridis represents an evolutionary trap for D. coccinellae.

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Section: Host Defenses Occurrence and Effectsupporting

confidence: 93%

Impact of host behavioral defenses on parasitization efficacy of a larval and adult parasitoid

et al. 2010

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“…Deste modo, outros fatores a serem considerados na interação entre pulgões e parasitóides são os critérios para escolha de hospedeiro entre espécies de pulgões, segundo seu tamanho ou estágio de desenvolvimento e sua influência no tamanho dos parasitóides adultos (Shu-Sheng & Carver 1985, Godfray 1994, Chau & Mackauer 2000. Como o tamanho pode ser um bom indicador de aptidão ou fecundidade, determinar hospedeiros que maximizem os tamanhos dos inimigos naturais pode ser um elemento importante na estruturação e viabilização de programas de controle biológico ou de manejo integrado de pragas.…”

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Diversidade e tamanho de himenópteros parasitóides de Brevicoryne brassicae L. e Aphis nerii Boyer de Fonscolombe (Hemiptera: Aphididae)

Vaz¹,

Tavares²,

Lomônaco³

2004

Neotrop. Entomol.

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-The objective of this work was to record the diversity of parasitoid of two aphid species, Brevicoryne brassicae L. and Aphis nerii Boyer de Fonscolombe in a site at Uberlândia, MG, and the relationship between parasitoid size and their mummies size, with reference to the host species. B. brassicae were collected on kale (Brassica oleracea L. var. acephala D.C.) and A nerii on milkweed (Asclepias curassavica L.). Samplings were made monthly from May, 1999 to May, 2000 in two experimental gardens. Morphometric measurements for both aphids and parasitoids were simplified by PCA analysis to achieve a multivariate size index. The parasitic Hymenoptera species associated with A. nerii were also found as parasitoids of B. brassicae, but with distinctive relative frequencies. Diaeretiella rapae (M'Intoch) (93.2%), Aphidius colemani Viereck (4.5%) and Lysiphlebus testaceipes (Cresson) (2.3%) were the parasitoids obtained from B. brassicae. Hyperparasitoids associated with these parasitoids were Alloxysta fuscicornis (Ashmead) (57.8%), Syrphophagus aphidivorus (Mayr) (25.1%) and Pachyneuron sp. (17.1%). The parasitoids found in A. nerii were: L. testaceipes (96.1%), A. colemani (3.9%) and the hyperparasitoids Pachyneuron sp. (85.2%) and S. aphidivorus (14.8%). Parasitoid size was correlated with mummy size for both A. nerii and B. brassicae. S. aphidivorus from A. nerii were significantly larger than those from B. brassicae. However, such differences were not detected for L. testaceipes, A. colemani or for Pachyneuron. Mummies of A. nerii were significantly larger than those of B. brassicae. No sexual dimorphism for size was detected.

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“…because of their size-dependent apparency (van Alphen & Drijver, 1982) or behavioural defence (van Alphen & Drijver, 1982;Brodeur et al, 1996;Harvey, 1996;Chau & Mackauer, 2000), or agedependent survival in hosts (especially koinobiont parasi toids: Driessen et al, 1991;Sequeira & Mackauer, 1994;Brodeur & Vet, 1995). Although this study did not address the question of the causes of the non-selective host use, we would like to highlight a potential explana tion specific to the system studied.…”

Section: Discussionmentioning

confidence: 95%

Large larvae of a flush-feeding moth (Epirrita autumnata, Lepidoptera: Geometridae) are not at a higher risk of parasitism: implications for the moth's life-history

Teder¹,

Tammaru²

2001

Eur. J. Entomol.

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Abstract. The effect of larval body size of Epirrita autumnata (Lepidoptera, Geometridae) on the risk of parasitism was studied in a field experiment. The experiment involved three pairwise exposures of different larval instars to parasitoids. Three hymenopteran species were responsible for most of the parasitism. Parasitism risk was found to be host-instar independent. This result was consis tent across parasitoid species and experiments. The results suggest that host use by larval parasitoids cannot constrain selection for larger body size in E. autumnata. However, high mortality due to parasitism may select for a short developmental period (the slowgrowth/high-mortality hypothesis), and smaller body sizes as a by-product. A strong selective effect of parasitism on the timing of larval development in E. autumnata is also unlikely. The larger was the host, the larger was the adult size of the parasitoid and the shorter its development time (for one species). We suggest that the lack of a preference-performance linkage in the system studied may be related to the time stress associated with the short phenological window ofhost vulnerability.

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Host-instar selection in the aphid parasitoid Monoctonus paulensis (Hymenoptera: Braconidae, Aphidiinae): a preference for small pea aphids

Cited by 48 publications

References 35 publications

Impact of host behavioral defenses on parasitization efficacy of a larval and adult parasitoid

Impact of host behavioral defenses on parasitization efficacy of a larval and adult parasitoid

Diversidade e tamanho de himenópteros parasitóides de Brevicoryne brassicae L. e Aphis nerii Boyer de Fonscolombe (Hemiptera: Aphididae)

Large larvae of a flush-feeding moth (Epirrita autumnata, Lepidoptera: Geometridae) are not at a higher risk of parasitism: implications for the moth's life-history

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