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Box hedges and topiary are often affected by box sucker, although the damage caused is usually superficial.
Box sucker damage. Credit: RHS/Science.
There are several species of sucker or psyllid that can be encountered by gardeners, they are sap sucking true bugs. Box sucker feeds at the shoot tips of box plants in spring.
Box can suffer from a number of other problems.
Damage from this insect is superficial and control is not usually necessary on established box hedges or topiary plants that are going to be clipped.
Regular clipping helps remove affected parts of the plant.
If damage is serious to plants that need to grow larger they can be sprayed with insecticide.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
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Brown leaves on woody plants
Chemical labels explained
Chemicals: using a sprayer
Chemicals: using safely and effectively
RHS research into box blight
RHS statement on pesticides in horticulture
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