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Tiny sap-sucking scale insects. They are 1-6mm long, and their whitish, grey-brown shells are covered by protective, waxy scales. The insects don't cause too much damage unless they are present in huge numbers, but some excrete an unsightly, sticky

The horse chestnut scale insect was first found in the UK in the late 1960s, having come over from southern Europe. It is now widespread and common in the south of the UK and Ireland, and is spreading northwards. Mature, adult horse chestnut scale

Small, sap-sucking insects.

appear in summer on the upper surface of lime tree leaves. These growths, or galls, may be yellowish green or red. lime treesn/aMore common garden pests affecting fruit treesApple sawflyCurrant blister aphidsPear leaf blister miteAphids

Of the black, red and yellow ants that are commonly seen in the garden, only the red ones (from the Myrmica species) sting. Other than that, ants are more of a nuisance than a pest. They feed mostly on insects, including other ants, and honeydew

is not a problem, but in excess the plants will suffer and could even die.Smudges of white, waxy deposits appear at the base of phormium leaves, deposited by sap-feeding insects. The mealybug can cause loss of vigour in the plant and, in extreme cases

Pears ripening on the tree are damaged by wasps excavating holes into the soft, juicy flesh. The holes are initially created by hungry birds, then wasps are attracted by the juice and move in.Pears that are still on the tree display hollowed out cavities, often with wasps still i...

The sap-feeding scale insect Unaspis euonymi is particularly attracted to Euonymus japonica, although it will feast on other evergreen euonymus too. The white males congregate on the leaves, but the brownish-black females live on the bark, making

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

The problem looks worse than it is. Miniscule mites secrete chemicals that cause blistering or blotches on the new leaves, which gradually turn blackish-brown. Although the mites breed prolifically, producing several generations over summer, the productivity of the tree isn't usu...