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  • Viburnum beetle damage on Viburnum opulus

    Viburnum beetle

    Viburnum beetle can cause severe defoliation of some Viburnum species, especially V. tinus and V. opulus.

  • ©RHS SCN0006176

    Viburnum scale

    Viburnum scale affects Viburnum tinus and ivy (Hedera), often causing a heavy coating of honeydew and sooty mould. 

  • Viburnum whitefly

    Viburnum whitefly

    The evergreen shrub laurustinus, Viburnum tinus, can be affected by a small insect known as the viburnum whitefly.

  • An adult wine weevil feeding on a rhododendron. Image: RHS, Horticultural Science

    Vine weevil

    Vine weevil is an insect that can infest a wide range of ornamental plants and fruits, especially those grown in containers. Adult vine weevils eat leaves and the grubs eat roots.

  • Walnut leaf blotch

    Walnut leaf blotch

    This fungal disease of walnut trees is unsightly, and in wet summers can cause significant early leaf fall. Unfortunately, it can also affect the fruit of the tree, rendering the walnuts useless.

  • Common wasps feeding on pear fruit

    Wasps (social) including hornets

    Wasps are beneficial in gardens, they feed their grubs on caterpillars and other insects and can reduce pest populations. Wasps can also ruin picnics during mid to late summer and may also damage ripe fruits. Disturbing a wasp nest when weeding or hedge trimming can result in multiple painful stings. 

  • Water: using softened

    Water: using softened and other types

    Many households have water-softening units fitted to reduce household limescale on appliances and to reduce the quantity of household detergents used. Advice can be confusing on whether softened water is safe for plant use.

  • ©RHS_SCN0004006

    Waterlily pests

    The leaves of waterlilies can be affected by aphids, moth larvae, beetles or midges which can give them a ragged appearance and lead to secondary rots.

  • Waterlogged lawns

    Waterlogged lawns

    Lawns can become waterlogged if water sits on the surface and drains slowly. Waterlogging is more likely to be a problem on compacted and clay soils. However, it is worth noting that patches of dead grass where the soil proves very difficult to re-wet can be caused by a fungal problem: dry patch.

  • Damage caused to garrya by cold weather. Credit:RHS/Advisory.

    Weather damage

    The development of brown leaves or dieback of shoots on a much valued specimen can be alarming, but does not necessarily mean you will lose the plant. More often than not, brown leaves, dieback, wilting and leaf drop are caused by weather damage; such as drought, waterlogging, snow, frost or hail.

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