Summary
IFyou take a look at briar rose bushes in the hedgerow, you might notice some strange, scarlet mossy growths, about the size of a golf ball, growing amongst the ripening rose hips. They're Robin's pin cushion galls, caused by a tiny gall wasp.
These growths, also known as bedeguar galls, began life last spring when a minute gall wasp laid its eggs in some unopened leaf buds. The galls grow slowly at first but become conspicuous during August, when they begin to swell and turn vivid scarlet.See the full content of this document
Extract
Country Diary
Then growth is swift and by the end of September the galls are fully grown, with a red mossy covering concealing the thick-walled gall that contai...
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