Carrot weevil, Listronotus oregonensis (LeConte) (Coleoptera: Curculionidae), is a pest of carrot (Daucus carota var. sativus Hoffmann; Apiaceae) throughout eastern Canada. Carrot weevil emergence and oviposition were monitored in commercial carrot fields in Nova Scotia. Cumulative degree days were calculated using a base temperature of 7 °C (DD7), and models were developed to predict cumulative emergence and oviposition using nonlinear regression. Cumulative emergence and oviposition were adequately explained as functions of DD7 by a three-parameter sigmoidal Hill equation. Our emergence model predicted initial and peak adult emergence at 35 and 387 DD7, respectively, with oviposition on carrot baits occurring as early as 42 DD7. Models were then validated to evaluate how well they performed. Oviposition on carrot plants began at the fourth true-leaf stage (342 DD7) and continued until eleventh true-leaf stage. Growers using these models can identify their window of opportunity to manage their carrot weevil populations targeting the majority of emerged adults before oviposition begins in the field.

胡萝卜象鼻虫，Listronotus oregonensis（蠹）（鞘翅目：象甲科），是胡萝卜的害虫（胡萝卜变种黄瓜，整个加拿大东部霍夫曼伞形科）。在新斯科舍省的商业胡萝卜田中监测了胡萝卜象鼻虫的出现和产卵。使用7°C（DD 7）的基准温度计算累计度数天，并使用非线性回归开发模型来预测累积出苗和产卵。通过三参数S型希尔方程将累积出现和产卵适当地解释为DD 7的函数。我们的出苗模型预测了35和387 DD 7处的成年初期和成年高峰。，早在42 DD 7上就在胡萝卜饵上产卵。然后验证模型以评估其执行情况。胡萝卜植物的产卵始于第四个真叶阶段（342 DD 7），一直持续到第十一个真叶阶段。使用这些模型的种植者可以在田间开始产卵之前确定他们的机会窗口，以管理针对大多数新兴成年人的胡萝卜象鼻虫种群。