Get expert help from the RHS to deal with pests and other problems

vine weevil

Vine weevil

Keep a watchful eye for signs of vine weevil beetles nibbling the edges of leaves and their grubs who will be munching on roots below the surface.

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  • Leek moth

    Leek moth

    Leek moth is mainly a problem in southern England but it is spreading north. The caterpillars feed within the foliage and stems or bulbs of leeks, onions and related vegetables.

  • ©RHS SCN0001720

    Lilac leaf mining moth

    The caterpillars of lilac leaf mining moth feed within the leaves of lilac, privet and ash. This results in brown blotches on the leaves, the leaves then become rolled up from the tip.

  • Red lily beetle

    Lily beetle

    Lilies (Lilium species and hybrids), Giant lilies (Cardiocrinum species) and fritillaries (Fritillaria species) can be extensively defoliated by the common and widespread insect known as lily beetle or red lily beetle.

  • ©RHS SCN0006644

    Lime nail gall mite

    During the summer months, the foliage of lime trees (Tilia) can become disfigured with red tack-like galls on the upper side of leaves. This is due to the feeding activities of a gall mite.

  • Lupin aphid

    Lupin aphid

    First detected in Britain in 1981, the lupin aphid is now widespread throughout Britain. This large aphid attacks annual and perennial lupins often causing plants to wilt.

  • Mealy cabbage aphid

    Mealy cabbage aphid

    Mealy cabbage aphid can severely damage young brassica plants by affecting the development of leaves at the plants’ growing points, it is less damaging once the plants are established.

  • Mealybugs. Image: RHS, Horticultural Science


    Glasshouse mealybugs are common sap-feeding insects that infest a wide range of houseplants and greenhouse plants. Mealybugs weaken plants and excrete a sticky substance (honeydew) on foliage, which allows the growth of sooty moulds.

  • Strawberry fruits picked by field mice

    Mice and voles

    Mice and voles are small rodents that sometimes cause problems in gardens and greenhouses.

  • Spotted snake millipede


    Millipedes can be numerous in soils with a high organic matter content but they generally have little impact on plants.

  • Mole. Image: ©


    Although infrequently seen, the presence of moles is easily detected by the molehills they create. Several measures can be taken to control moles or encourage them to move elsewhere.

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