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Remember those caterpillars I found on my client’s pelargoniums?

Well – thank you to all who replied. Plant Mad Nige offered a tentative ID as an Angle Shades Moth – but here’s the pic of their caterpillars from the RHS’s advice sheet on the subject:

(image: Tim Sandall).

Not really very similar to my little critter:

But enter the RHS’s Principal Entomologist (no less), A J Halstead, who suggests my little friend is a rather more humbly-named Cabbage Moth – aka Mamestra brassicae. I looked this up on UK Moths – and sure enough:

(picture (c) Dave Griffin)

I think we have our culprit. Sadly he is a culprit, too – the moth is described as a “notorious pest” on UK Moth’s info page on the subject, scoffing not only all members of the brassica family but clearly pelargoniums too.

Still – I love solving a good mystery. Now I have to go murder a lot of rather pretty caterpillars…