Environmental Entomology (1988) 17, 330-336

Guy Boivin (1988)
Effects of carrot developmental stages on feeding. and oviposition of carrot weevil, Listronotus oregonensis (Le Conte) (Coleoptera: Curculionidae)
Environmental Entomology 17 (2), 330-336
Abstract: Adult feeding and oviposition punctures and subsequent larval feeding of the carrot weevil (CW), Listronotus oregonensis (Le Conte), did not decrease carrot stand significantly. CW started to oviposit by 147 ± 9 degree-days (DD) (base 7°C) and 90% of the eggs were deposited by 456 ± 47 DD. However, females started to oviposit in carrot seedlings only when the carrots reached the four-true-leaf stage and 98% of the eggs were found on carrot leaf, petiole and crown. A significant inverse relation was found between the date of sowing and the number of eggs and subsequent damage at harvest. Carrots sown after 400-450 DD would escape most CW damage.
(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:
damage/losses/economics
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Listronotus oregonensis	Carrot (Daucus carota)