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Block Island, Washington County, Rhode Island, USA
August 7, 2016
I found this parasitized Plutella xylostella cocoon on Cakile edentula on Scotch Beach. I kept it indoors at about the same temperature as outdoors and on August 9, it darkened considerably (see second image). Since I left the island on August 14, I've had to keep it in air conditioned rooms (it's currently in my dorm room). Nothing has emerged yet, so I'm thinking this one may overwinter as a pupa. Ideas?

Images of this individual: tag all
Ichneumon Ichneumon

Moved from ID Request. Thanks, Ross. I did not expect there to be so many possibilities! This is now the third such cocoon I've seen. The first I found in 2015 and didn't collect since I didn't do any rearing that summer. (Besides, the wasp had already emerged anyway.) I found a second earlier this past spring that was empty. Additionally, I found several Plutella caterpillars in early July, one of which I successfully raised to adulthood. If this one doesn't make it I guess I'll just have to look for a few more next year.

Sounds familiar…
I've collected quite a few of these campopleginae cocoons here, only one of which eventually produced an adult.

Diamondback moth larvae are attacked by a hugh array of ichneumons and braconids - close to two hundred known species, most of which are ichneumons and braconids. An adult may eventually emerge, but sometimes the larva doesn't develop and just dies, something to keep in mind.

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