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A means by which a selected natural mechanism (eg, parasitism, predation, disease) is used to control pests. Has the advantage of minimising the legal, health and environmental hazards associated with chemical control.

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

.undisturbed ground, under stones, logs and pots. Prefers cool, damp habitats.all year roundMore common garden pestsWaspsMolesSnailsAnts

of excavated soil on lawns and around the garden - and underground tunnels, found when digging the soil or making a new planting hole. Mole traps are very effective. Insert one in a tunnel, cover it with turf and an upturned bucket to exclude light, and check

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

, death.Destroy infested plants. Check new plants carefully to make sure they are not infected.phormiumsall year roundMore common garden pestsMealybugsRed spider miteEuonymus scaleCapsid bugs

wasp traps to catch them before they do any damage. Otherwise, there is little that can be done.Nearby wasp nests can be eliminated by calling in professional pest control companies, or if the infestation is small enough, tackle it yourself with an over

can be eliminated by calling in professional pest control companies, or if the nest is small enough, by using a proprietory product from any hardware store.fruit trees and busheslate-summer to autumnMore common garden pestsSlugsAphidsEarwigsMealybugs

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

, pyracantha, sorbus all year roundMore common garden pestsAphidsWhiteflyLeaf miner flyEuonymus scale