The seasonal occurrence of four species of egg parasitoids of the tarnished plant bug ( Lygus lineolaris ) was determined in three different habitais: fields of mixed weeds. alfalfa ( Medicago sativa L.). and crown vetch ( Coronilla varia L.) in southwestern Quebec in 1991 and 1992. Parasitoids studied were the mymarids Anaphes iole Girault, Polynema pratensiphagum (Walley), and Erythmelus miridiphagus Dozier and a scelionid, Telenomus sp. Adult populations of these parasitoids showed three or four population peaks in all habitats throughout the season. Adult parasitoid activity started during the first egg-laying period of L . lineolaris at a temperature accumulation of 73 degree-days (DD). The overwintering period began in mid-October at 1277 and 1058 DD for 1991 and 1992, respectively. All the parasitoids had a strong synchrony with L . lineolaris populations; specifically, marked peaks in the adult population of all species were in synchrony with the egg-laying periods of L . lineolaris .
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Al-Ghamdi et al. (1995) studied this question.
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