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Unidentified caterpillar

Observed: 4th June 2010 By: yanyan’s reputation in Invertebratesyan’s reputation in Invertebratesyan’s reputation in Invertebrates
11 June 2010
11 June 2010b
04 June 2010

Large green caterpillar that munched its way up and down my beautiful verbascum for a week then disappeared. Third pic gives an idea of scale and shows last remaining flower on verbascum, all the rest had been chomped. Any ideas what it could be?

Species interactions

No interactions present.

Species with which Grey Chi (Antitype chi) interacts


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RHoman and Michael Skelton, thank you both for your help. Very interesting comments. I'm glad I didn't remove the caterpillar, though I was tempted when I realised how destructive it was.