Environmental Entomology (1986) 15, 274-280

Keith R. Hopper (1986)
Preference, acceptance, and fitness components of Microplitis croceipes (Hymenoptera: Braconidae) attacking various instars of Heliothis virescens (Lepidoptera: Noctuidae)
Environmental Entomology 15 (2), 274-280
Abstract: A laboratory experiment showed that preferences of Microplitis croceipes (Cresson) for certain larval instars of Heliothis virescens (F.) may arise in part from variation in probability of parasitization once a parasitoid encounters a host. Host acceptance was higher and handling time shorter for preferred host instars. In support of the hypothesis that parasitoids choose host stages that maximize fitness, development rate was faster and adult head width of wasps was larger for wasps from hosts parasitized in preferred instars. However, the number of oocytes was smallest in wasps from hosts parasitized in the most preferred instar, suggesting a trade-off between development rate and fecundity. Furthermore, egg/larval mortality, pupal mortality, and adult mortality increased monotonically with host instar parasitized. Although the fitness components measured did not relate simply to instar preferences, reasons were found for avoidance of first instar and fifth instar hosts, the least preferred instars.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Keith R. Hopper

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.
	Heliothis virescens
Glabromicroplitis croceipes (parasitoid)	Heliothis virescens