According to the Royal Horticultural Society the number one problem on the 2010 garden pests list is the Viburnum Beetle.In April-May the grub of the Viburnum Beetle, (Pyrrhalta viburni), emerges and starts to feed on the foliage. These hungry grubs can cause severe defoliation especially on its preferred host Viburnum opulus, also known as guelder rose or snowball bush. As you walk around the grounds the defoliation has started and by the end of June will reduce the foliage to lacework, leaving only the midrib and larger veins.
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