Abstract
The willow—carrot aphid (Cavariella aegopodii (Scopoli)) is a widespread pest of carrot and often causes considerable loss of yield in early and mid-season crops. Parsnip, celery, parsley and other cultivated umbellifers such as chervil and fennel can also be attacked by this aphid and the willow—parsnip aphid (Cavariella theobaldi (Gillette & Bragg)). The willow—carrot aphid overwinters in the egg stage on willow trees, especially the crack willow (Salix fragilis) and the white willow (Salix alba), and also as an adult or immature stage on host crops that remain in the ground until spring.
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