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Tetrastichus brevistigma (Gahan) parasitized last in stars, prepupae, and pupae of the elm leaf beetle, Xanthogaleruca (=Pyrrhalta) luteola (MiilIer). Although T. brevistigma is deuterotokous with males constituting 3.1% of field samples, males were never observed in 21 generations reared in the laboratory. Mean longevity (±SEM) at a 15:9 (L:D) photoperiod and 25 was 21 ± 0.76d. Mean fecundity (±SEM) was 144 ±7.9 offspring. Percentage of parasitization and the number of parasitoids produced per host decreased when elm leaf beetle pupae were older than 72 h. Diapause was 3, 4, 72.5, and 46.7% at 15:9, 14:10, 13: 11, and 12:12 (photo: scotophase), respectively. The photosensitive stage of T. brevistigma appears to be the egg or first in star. Parasitized pupae could be stored at 2"C for 30 d without affecting emergence of T. brevistigma. Feasibility of mass rearing T. brevistigma is discussed.
Document Type: Research Article
Publication date: December 1, 1990
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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.