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This is in a domestic garden, in Cornwall, UK. What is it?

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7

Yes, they are tent caterpillars. No, you really don't need to burn them. Just rip the tent open and the birds should take care of the caterpillars, without their protective tent.

https://www.rivercare.org/news/tent-caterpillars-are-for-the-birds

http://www.watoxics.org/files/tentcaterpillars.pdf

7

Tent caterpillars. Very common in the US and they can be very damaging if they strip all the leaves off the plant. Cut open the "tent" and you should see baby caterpillars in there.

Get a good fire going then cut off the branch and burn it immediately.

  • Is that the small ones about the size of a dollar bill also? – black thumb May 27 '16 at 14:21
  • I don't know for sure. But the tents start out small, and grow as the caterpillars grow. – Bulrush May 27 '16 at 15:06
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    Why burn it? Why not just leave the wildlife alone? – vclaw May 27 '16 at 16:29
  • Gypsy moth caterpillars do not build tents, so it is not that. And they are very rare in the UK. You can't say they are destructive unless you know what species it actually is. They are part of the local ecosystem. – vclaw May 28 '16 at 20:42
  • @vclaw: You're right, I just checked Wikipedia. You must have some other tent caterpillar. It looks like for years my friends were wrong about the type of tent caterpillar that was all over where I grew up. So you're safe from the gypsy moth and their incessant tambourine shaking! lol. Can you imagine little tiny tambourines? – Bulrush May 29 '16 at 12:35
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I know you've accepted an answer, but I'll add this, because, without knowing quite what they are, you may be endangering your or your family's health by trying to deal with them. Given where you are, these are likely to be Brown Tail Moth tent caterpillars - if you are asthmatic, or anyone in your family is, you have to be very careful not to inhale the fine hairs from the caterpillars, which may also be mixed in with the tent fibres. These hairs are also highly irritant to the skin, so protective clothing should be worn if you wish to tackle the tents yourselves, although this is best done in winter rather than now. When we had these in late spring three years ago in street trees here in West London, the area was cordoned off and a crew wearing full hazmat suits and breathing gear came to cut them out, paid for by the Council. Shouldn't think Councils can afford to do this any more, but it's worth a try - otherwise, advice from East Devon Council as to how to remove them safely in the link below

http://eastdevon.gov.uk/pest-control/brown-tail-moth-caterpillar/

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