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How to deal with box blight, spotty holly and sickly azaleas, by garden expert Helen Yemm

Box hedges can be devastated by box tree caterpillar
Box hedges can be devastated by box tree caterpillar Credit: gapphotos.com

Every week, Telegraph gardening expert Helen Yemm gives tips and advice on all your gardening problems whether at home or on your allotment. If you have a question, see below for how to contact her.

KEEP TRACK OF GARDEN NASTIES

Robin Jaensch sent me a depressing picture of his front garden box hedge that is in a really bad way. His neighbour thinks the problem is caused by box tree caterpillars and indeed Robin has seen loads “hanging from threads” in the vicinity. Can he restore the hedge by spraying with something that will nobble the beasts, or would it be better to replace it?

Looking at the extent of the damage (the hedge is almost leafless and brown), I would say it would make for an...

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