swallowtail catepillar

Asked September 10, 2017, 7:40 PM EDT

Noticed what I assume are 1st instar black swallowtails (.5", thin, black with thin white stripe in middle) on rue this weekend. Isn't this late? Will they survive? Anything I can do?

Anne Arundel County Maryland

3 Responses

Send us photos of the caterpillar so we can see what you are referring to.
In general, black swallowtails can have up to 3 generations a year. Leave them be to continue their life cycle.


Just assume it is (as confirmed by current size and color). Isn't this quite late?

These caterpillars in the last generation of the year will overwinter as pupae (inside the chrysalis). Doesn't seem too late for that.