caa a22 4500 386361045 CHVBK 20180307111915.0 cr unu---uuuuu 161130e198910 xx s 000 0 eng 10.4039/Ent121921-10 doi S0008347X00035811 pii (NATIONALLICENCE)cambridge-10.4039/Ent121921-10 DIAPAUSE STATUS OF THE OVERWINTERING GENERATION OF THE CARROT RUST FLY, PSILA ROSAE (FAB.) (DIPTERA: PSILIDAE), IN ONTARIO [Elektronische Daten] The incidence of diapause in pupae of the second (overwintering) generation of the carrot rust fly, Psila rosae (Fab.), at the Holland Marsh, Ont., was determined at intervals during fall and spring of 1982-1983, 1984-1985, and 1985-1986, by placing pupae collected from carrot plantings at developmental temperatures in the laboratory. The percentage of samples in diapause increased with time of sampling from late September on, until 100% of the pupae collected in late November or early December were in diapause. The percentage in diapause of pupae overwintering in the ground of an insectary at Jordan Station, Ont., decreased from January onward until, by early April, diapause was virtually absent. In spring collections from the Holland Marsh, some evidence of diapause was detected in the earliest samples, indicating that diapause is a factor that should be considered when degree-day models are being developed for the carrot rust fly. Copyright © Entomological Society of Canada 1989 Stevenson A.B. Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0 Barszcz E.S. Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0 The Canadian Entomologist Cambridge University Press 121/10(1989-10), 921-928 0008-347X 121:10<921 1989 121 TCE https://doi.org/10.4039/Ent121921-10 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent121921-10 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stevenson A.B. Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0 NATIONALLICENCE 700 1- Barszcz E.S. Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 121/10(1989-10), 921-928 0008-347X 121:10<921 1989 121 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge