Abstract
Field studies were conducted in 2004 and 2005 to determine the effectiveness of a seed treatment, an in-furrow treatment, and foliar applications of insecticides for control of the carrot weevil [Listronotus oregonensis (Coleoptera: Curculionidae)] in processing carrot (Daucus carota). Carrot seed treated with fipronil resulted in significantly less root damage at harvest then did the in-furrow application of thiamethoxam or multiple foliar applications of diazinon or spinosad in both years, and resulted in significantly higher yields compared with all other treatments in 2004. Seed treatments with fipronil should be considered for future registration on carrot. Such registration would allow early to midseason protection of carrot from weevil damage and compliment the current management program of foliar sprays to control adult weevils.
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