Eur. J. Entomol. 105 (3): 489-494, 2008 | DOI: 10.14411/eje.2008.063

The effect of the quality and size of host aphid species on the biological characteristics of Aphidius colemani (Hymenoptera: Braconidae: Aphidiinae)

Marcus Vinicius SAMPAIO*, Vanda Helena Paes BUENO, Bruno Freitas DE CONTI
Universidade Federal de Lavras, Departamento de Entomologia, Caixa postal 3537, CEP 37200-000, Lavras-MG, Brazil;

A suitable host provides, at least, the minimum nutritional and physiological conditions for the development of the immature stages of a parasitoid. Host quality may influence the developmental time, mortality rate, longevity and fecundity of parasitoids. This work evaluates the suitability and quality of Aphis gossypii Glover, Brevicoryne brassicae (Linné), Myzus persicae (Sulzer), Rhopalosiphum maidis (Fitch) and Schizaphis graminum (Rondani) as hosts for Aphidius colemani Viereck. Twenty second-instar nymphs of each aphid species were exposed to parasitism for one hour, and then kept in a climatic chamber at 22 ± 1°C, 70 ± 10% RH and a 12 h photophase. The aphid B. brassicae was unsuitable for the development of A. colemani. The different aphid host species varied in size: M. persicae > (R. maidis = S. graminum) > A. gossypii. Parasitoid fitness decreased accordingly when reared on (M. persicae = R. maidis) > S. graminum > A. gossypii. Large hosts seem to be better than small hosts based on parasitoid size. Egg load of A. colemani was related probably more on the ability of the parasitoid larva to obtain nutritional resources from the different host species than on host size.

Keywords: Aphidius colemani, Aphis gossypii, Aphidiidae, Aphidiinae, Braconidae, Brevicoryne brassicae, fitness, host quality, Myzus persicae, parasitoid, Rhopalosiphum maidis, Schizaphis graminum

Received: September 18, 2007; Accepted: May 9, 2008; Revised: May 9, 2008; Published: July 31, 2008Show citation

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SAMPAIO, M.V., BUENO, V.H.P., & DE CONTI, B.F. (2008). The effect of the quality and size of host aphid species on the biological characteristics of Aphidius colemani (Hymenoptera: Braconidae: Aphidiinae). Eur. J. Entomol., 105(3), 489-494. doi: 10.14411/eje.2008.063.
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