He's uncovered a tiny fragment the size of a small ladybird.
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He said there was always a potential for this ladybird to spread quite naturally.
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The ladybird has been introduced in Holland as a biological control to get rid of sap sucking pests like aphids.
The adult H. axyridis is about 7mm long, slightly larger than the seven-spot ladybird native to the UK. It comes in a range of colours and patterns.
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