You might remember that, a few months ago, I posted about the (supposedly) empty galls of the Bedeguar gall wasp I’d found during a wet walk at Cosmeston Lakes Country Park (Empty pincushions, January 2020). A week or so after writing that post, I was back at Cosmeston and remembered to harvest one of the galls, which has ever since been sitting in a sealed jar on my kitchen windowsill.
Although the many holes in the gall made me think that all of its inhabitants had already hatched, I decided to wait and see if anything else appeared. Two days ago I noticed movement in the jar and, taking a closer look, found two different species of wasp had emerged.
This is one of them, and I’m 99% certain this is the gall causer itself, the Bedeguar gall wasp, Diplolepis rosae, the offspring of the wasp that caused the gall to form in the first place. These wasps are so tiny – just 3-4 mm long – that most of us don’t usually see them so I was very pleased to have this one emerge from its gall.
There is a bit of a story attached to the second wasp that emerged, and I am currently awaiting confirmation of its identity. As soon as I know more, I’ll write it up in a further post.