Pests

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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  • Narcissus bulb fly

    Narcissus bulb fly

    Heavy attacks of narcissus bulb fly larvae can kill daffodil bulbs and some other plants in the Amaryllidaceae. This can lead to a severely reduced spring display.

  • Oak decline. Copyright: RHS

    Oak decline

    The phenomenon known as oak decline has been known in the UK for nearly one hundred years. However, in the last few years there has been an alarming increase in the number of trees affected by acute oak decline – a fast-acting problem thought to be caused by bacteria.

  • Oak knopper gall

    Oak gall wasps

    Odd-shaped growths on the foliage, flowers, acorns and stems of oak trees are often caused by gall wasps.

  • © Forestry Commission SCN0005999

    Oak processionary moth

    Oak processionary moth is a non-native moth that has become established in parts of London and its surrounds. Whilst it can defoliate oak trees the primary concern is the caterpillars hairs, these can cause irritation if in contact with human skin. These caterpillars should not be handled nor approached .

  • © RHS SCN0006520

    Oak slugworm

    The grazing activities of the slug-like larvae of the oak slugworm sawfly can cause leaves on oak and lime trees to turn brown and dry up.

  • ©RHS SCN0006420

    Onion fly

    The maggots of onion fly can damage the roots and bulbs of onions and some related plants, sometimes killing seedlings.

  • ©RHS PUB0008205

    Orchid and other diaspid scale insects

    Small sap sucking diaspid scale insects can encrust the leaves and stems of glasshouse orchids and some other glasshouse plants.

  • Pea and bean weevil adult damage on broad beans

    Pea and bean weevils

    Adult pea and bean weevils can cause distinctive notch-like damage to the leaf margins of young pea and broad bean plants in spring. This can be alarming but in most cases does not affect the growth of the crop.

  • Pea moth

    Pea moth

    Pea moth caterpillars feed inside pea pods but the, often severe, damage is often only spotted at harvest. Consequently, the pods need to be shelled with care to avoid contamination.

  • ©RHS SCN0006497

    Pear and cherry slugworm

    The grazing activities slug-like larvae of the pear and cherry slugworm sawfly can cause leaves on pears, cherries, hawthorn, plum, Cotoneaster, Chaenomeles and Sorbus to dry up and turn brown.

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