Davey, P., 2009: A local and decreasing species in the British Isles, the larva living up to five years inside a wide variety of deciduous trees. A colony can occasionally destroy its host. The caterpillar exudes a strong goat like scent, a polyphenol called cossine (C16H24O2) that can be detected down-wind of an infected tree, and is reputed to be distasteful to birds (MOGBI Vol 2). When full grown (up to 100 mm long), the caterpillar is occasionally encountered well away from its host tree as... Read More

Recorded in 12 (30%) of 40 10k Squares. First Recorded in 1947. Last Recorded in 2018. (Data up to end 2019) Additional Stats

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