Page last updated at 10:54 GMT, Friday, 10 October 2008 11:54 UK

The spread of the toxic moth

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The spread of an invasive moth species is causing scientists concern.

The oak processionary moth not only defoliates trees, but can also cause a nasty allergic reaction in some people.

Monique Simmonds, a biologist from the Royal Botanic Gardens Kew, is working on finding ways to combat the problem.

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