Pissodes; HYMENOPTERAN-PARASITES; Eubazus; Parasite development; PLANT-HOSTS; Abies, Picea & Pinus; Canada & Europe; BRITISH-COLUMBIA; Vancouver Island, Fair Harbour; PALAEARCTIC-REGION; Europe; Hymenopteran parasite development, population comparisons Pissodes castaneus; Pissodes pini; Pissodes piniphilus; HYMENOPTERAN-PARASITES; Eubazus semirugosus; Parasite development, population comparisons, plant hosts, Europe Pissodes piceae; HYMENOPTERAN-PARASITES; Eubazus; Parasite development, population comparisons, plant hosts, Europe Pissodes strobi; HYMENOPTERAN-PARASITES; Eubazus crassigaster; Parasite development, population comparisons, plant hosts, British Columbia Pissodes validirostris; HYMENOPTERAN-PARASITES; Eubazus robustus; Parasite development, population comparisons, plant hosts, Europe Eubazus; DEVELOPMENT-; VARIATION-; COLEOPTERAN-HOSTS; Pissodes; Parasite development, Canada & Europe; PALAEARCTIC-REGION; Europe; Population comparisons Eubazus crassigaster; COLEOPTERAN-HOSTS; Pissodes strobi; Parasite development; BRITISH-COLUMBIA; Vancouver Island, Fair Harbour; Development, population comparisons Eubazus robustus; COLEOPTERAN-HOSTS; Pissodes validirostris; Parasite development, population comparisons, Europe Eubazus semirugosus; COLEOPTERAN-HOSTS; Pissodes castaneus, P. pini & P. piniphilus; Parasite development, population comparisons, Europe Observations were made on the developmental responses of the North American braconid species, Eubazus crassigaster, a parasitoid of the white pine weevil, Pissoles strobi, and three European congeneric species, E. semirugosus, E. robustus, and Eubazus sp. Several populations of Eubazus spp. were compared in their phenology in the laboratory and under natural conditions. When reared in the laboratory on non-diapausing Pissodes castaneus, mountain populations of E. semirugosus and E. robustus entered into an obligatory diapause in the host larva, whereas all the other populations tested developed continuously. Diapausing larvae continued their development only after having experienced at least three months at 2 degree C. Non-diapausing populations of Eubazus spp. significantly differed in the duration of pre-imaginal development, with E. semirugosus being the fastest developing species and E. robustus the slowest. Outdoor rearings of Eubazus spp. on P. castaneus showed that E. crassigaster, Eubazus sp. and the lowland biotype of E. semirugosus emerged in the year of oviposition if this occurred early enough to allow parasitoid development. In contrast, a majority of E. robustus individuals overwintered in the host larvae, regardless of the oviposition date. The diapausing, mountain biotype of E. semirugosus is considered as the most promising candidate for control of P. strobi in Canada, because it is likely to be better adapted to the life cycle of the target host than the other Eubazus spp., including the native E. crassigaster.