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Laboratory Rearing of Tetrastichus gallerucae (Hymenoptera: Eulophidae), an Egg Parasitoid of the Elm Leaf Beetle (Coleoptera: ChrysomeIidae)

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Abstract:

Rearing of Tetrastichus gallerucae (Fonscolombe), a parasitoid of the elm leaf beetle, Xanthogaleruca luteola (Müller), was conducted at 15:9 (L:D) photoperiod, 25, and 80-90% relative humidity. Under these conditions, adult males lived for an average of 23 d and females for 59 d when fed a 1:1 water-honey mixture. Adult T. gallerucae began to emerge from elm leaf beetle egg masses 28 d after exposure to T. gallerucae when held at 20, 12 d at 25, 11 d at 27, and 10 d at 30. Peak emergence occurred after 13 d at 25. Male T. gallerucae emerged first, remained close to the egg mass, and mated with their sisters. T. gallerucae exhibited a female-biased sexratio. T. gallerucae would parasitize elm leaf beetle eggs that were between 1 and 104 h old at 25. Parasitization of egg masses exposed to single females for 48 h averaged 44.9%. Percent parasitization of eggs within parasitized masses ranged from 3.5 to 100 (x = 53.1%).Host feeding by female T. gallerucae destroyed approximately 65% of the eggs presented. The number of eggs in an egg mass and the number of parasitized eggs in a mass had no effect on the percentage of males produced.

Document Type: Research Article

Publication date: October 1, 1988

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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