Environmental Entomology (2004) 33, 1523-1527

Andrea S. Demmon, Heidi J. Nelson, Patricia J. Ryan, Anthony R. Ives and William E. Snyder (2004)
Aphidius ervi (Hymenoptera: Braconidae) increases its adult size by disrupting host wing development
Environmental Entomology 33 (6), 1523-1527
Abstract: The parasitoid wasp Aphidius ervi (Haliday) disrupts formation of wings by its host, the pea aphid, Acyrthosiphon pisum (Harris). Because apterous aphids are larger than alates, we hypothesized that blocking wing formation leads to larger parasitoids emerging from apterous hosts. In an initial experiment, we found that parasitoid larvae could not always prevent host wing formation when the parasitoid began development in fourth instar hosts, allowing us to experimentally test the hypothesis. Both male and female parasitoids emerging from hosts that did not develop wings were heavier than those emerging from alate hosts. Parasitoids emerging from apterous mummies also had significantly longer thoraxes. For insect parasitoids, increasing size has been positively correlated with several measures of fitness. Thus, A. ervi likely gains a fitness advantage by disrupting host wing development.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Anthony R. Ives

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Acyrthosiphon pisum
Aphidius ervi (parasitoid)	Acyrthosiphon pisum