When in Lancashire recently, we saw a prunus avium tree totally covered in a web, as if covered in clingfilm. Can you please advise us what would have caused this and also what is the cure because I have to advise the owners? Thanks.

This is classic caterpillar infestation. Many organic or synthetic insecticides exist that would eradicate this problem. Any good garden centre would be able to advise. I prefer to use a pyrethroid-based insecticide against caterpillars. There is also a bio-control agent (Bacillus thuringiensis) that would prove effective. Again, I am sure this product is available in good garden centres.

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