Environmental Entomology (1987) 16, 503-506

Guy Boivin (1987)
Seasonal occurrence and geographical distribution of the carrot rust fly (Diptera: Psilidae) in Quebec
Environmental Entomology 16 (2), 503-506
Abstract: Catches of adult carrot rust flies, Psila rosae (F.), in sticky traps determined that this pest is present throughout the carrot-growing regions of Quebec, although its populations are very small in some areas. Two distinct periods of adult activity were recorded, indicating two adult generations per year. When summation for 4 yr of degree-days (DD) above 3°C started 1 April, overwintering adults appeared at 361.8 ± 33.1 DD and 50% of the captures were made at 515.3 ± 47.2 DD. The first-generation catch started at 1554.8 ± 156.0 DD and 50% of the capture was reached at 1800.0 ± 155.6 DD. Sowing dates of carrots had no significant effects on the percentage of second-generation carrot rust fly damage at harvest time.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Guy Boivin

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Chamaepsila rosae	Carrot (Daucus carota)	Canada (east)