Seasonal Population Density of Anagrus giraulti (Hymenoptera: Mymaridae), an Egg Parasitoid of Circulifer tenellus and Empoasca spp. (Homoptera: Cicadellidae)

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Abstract
Anagrus giraulti Crawford, a mymarid egg parasitoid, was monitored in the field attacking the eggs of the beet leafhopper, Circulifer tenellus (Baker), and Empoasca spp. on sugar beets from 1982 to 1985. This parasitoid was active throughout each year in Riverside, Calif. Parasitization reached 70.5% in 1982, 96.2% in 1983, 95.8% in 1984, and 83.5% in 1985. The Empoasca spp. complex was most abundant throughout the study period, with peak populations occurring in the spring and fall months. Peaks of C. tenellus abundance occurred in late May to June and again in September. Overwintering diapause of A. giraulti was not observed in Riverside, Calif.