A Wasp in Coastguard Field

There is a scrubby sallow growing on the seaward side of the hibernaculum in Coastguard Field. Giving it close examination recently discovered a tiny (1.5mm long) parasitic wasp lurking within its branches. It was a Diglyphus isaea, a species that is commercially available as a biological control for several species of leafminer. An adult wasp will seek out the larvae that create leaf mines (in Chrysanthemums for example) and lay eggs in the leaf mining larva. The process will kill the leaf mining larva, and the emerging wasp larva then uses the leaf mining larva as food. While this might sound like a grisly process, it is entirely natural behaviour that has been utilised for commercial benefit. Introduction of such species as Diglyphus isaea into commercial glasshouses gives opportunity for escape into the natural environment, and the one found in Coastguard Field will have originated this way. As to how many generations of parasitoid have passed between the introduction and this discovery can never be known, but it is another new record for the Country Park.

 

Diglyphus isaea

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