The cinnabar moth is a natural enemy of tansy ragwort. The noxious weed is an invasive plant from Europe, and the moth, also from Europe, was introduced here on purpose a few decades ago as a way of biological control. In the 1960s tansy seemed more out of control than it is today.
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This blog has been mostly retired but I will still check the comments for moderation occasionally on slow days. Think twice, post once. I place a high value on civility and publish them, or not, accordingly. Some might call this censorship. I call it having editorial standards. We both would be right.