Geographic variation in host instar and species preference of Microplitis demolitor (Wilkinson) (Hymenoptera: Braconidae) towards two of its native hosts, Helicoverpa punctigera (Wallengren) and Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)

Seymour, Jamie E., and Jones, Rhondda E. (2001) Geographic variation in host instar and species preference of Microplitis demolitor (Wilkinson) (Hymenoptera: Braconidae) towards two of its native hosts, Helicoverpa punctigera (Wallengren) and Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae). Australian Journal of Entomology, 40 (3). pp. 245-248.

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Abstract

Ovipositing females of the parasitoid Microplitis demolitor discriminated between larvae of two major Australian lepidopteran pest species, Helicoverpa armigera (corn earworm) and Helicoverpa punctigera (native budworm). Parasitoid populations from different geographical locations differed in their host preferences. The pattern of variation showed consistent change of preference with latitude and suggested that evolution of this preference may be driven by the hosts' local abundance and seasonal phenology. Microplitis demolitor showed a strong preference for second- and third-instar host larvae over all other host larval instars. This preference probably represented a compromise between the improved host survivorship provided by older larvae and the low risk of injury to the ovipositing parasitoid when attacking younger larvae.

Item ID: 13107
Item Type: Article (Refereed Research - C1)
Keywords: host discrimination; instar preference; parasitoid
ISSN: 1440-6055
Date Deposited: 02 Oct 2012 06:17
FoR Codes: 06 BIOLOGICAL SCIENCES > 0699 Other Biological Sciences > 069999 Biological Sciences not elsewhere classified @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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