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The squamae do look to be yellow through a definite brown wing base I agree! As the frons is so broad I would have thought that would be mentioned.

I found the host plant of D.planipalpis is Sinapis arvensis, I have a patch of that I think (I recognise the leaves) which I left on the north side of my south facing hedge.

http://www.brc.ac...ceid=14294