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Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Caterpillars, maggots, grubs, and similar immature insects - Larger than 3/4 inch long > Black swallowtail

Black swallowtail

Papilio polyxenes

Black swallowtail

Jeff Hahn

Size: Up to 1 1/2 inches long

Where/When: Feeds on many plants in the Umbelliferae including parsley, carrots, dill, fennel, celery, and Queen Anne's lace. Prefers to feed on the flowers and seeds of these plants. Present July to September.

Significance: Feeding is rarely sufficient to seriously injure plants.

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