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Viburnum beetle was named as the number one pest by the RHS in 2010, stealing the crown from slugs and snails. It's native to the UK, but is becoming more widespread. Most of the leaf damage is caused by the stripey, beige-coloured larvae, though

Chris Beardshaw demonstrates how to prune an old viburnum, removing sideshoots and woody growth to reinvigorate the plant and encourage flowering.springMore advice on pruning plantsHow to prune shrub rosesAdvice on pruning techniquesHow to summer