If you use chemicals in your garden it's vital to do so correctly, following the manufacturer's instructions. We'll help show you how

Spraying chemicals

See our advice on what to bear in mind when using chemicals in your garden.

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  • Replant disease

    Replant disease

    Replant disorder or replant disease refers to the problem of re-establishing plants in soil where the same species was previously grown. Roses are particularly prone, though it can affect other trees and shrubs.

  • Rose black spot. Image: RHS/Tim Sandall

    Rose black spot

    Rose black spot is a fungal disease of roses where purple or black spots develop on leaves, which often drop early.

  • Rose rust

    Rose rust

    Rose rust is a fungal disease of roses, producing orange or black spore pustules on the undersides of leaves, and orange pustules on distorted stems.

  • Runner and French bean rust

    Runner and French bean rust

    Beans can be affected by a fungal disease called rust. Heavy attacks may reduce plant vigour and hence yield but, thankfully, the attack often develops too late to have a serious effect.


  • Scale insects on bay. Image: RHS, Horticultural Science

    Scale insects

    Scales are limpet-like insects that feed by sucking sap from a wide range of plants, including houseplants, greenhouse plants and many fruit and ornamental plants grown outdoors. There are more than 25 species of scale insect in the UK Scale insects can weaken plants and some excrete a sticky substance (honeydew) on foliage, which allows the growth of black, sooty moulds.

  • © RHS WSYD0014517

    Shepherd's purse

    Shepherd’s purse (Capsella bursa-pastoris) is a fast-growing and prolific annual weed, known to many gardeners for the sheer number of seedlings produced each season and the time it can take to control.

  • Silver leaf on plum. Image: RHS, Horticultural Science

    Silver leaf

    Silver leaf is a fungal disease of the wood and leaves of some trees, especially plums, apples, apricots and cherries. The fungus infects the wood through wounds and causes a silvering of the leaves followed by death of the branch.

  • ©RHS SCN0001899


    Slugs are persistent and widespread pests which can cause havoc in the garden, eating holes in leaves, stems, flowers, tubers and bulbs. They can cause damage throughout the year on a wide range of plants, but seedlings and new growth on herbaceous plants in spring are most at risk.

  • Grey mould on snowdrops. Image: RHS, Horticultural Science

    Snowdrop grey mould

    Grey mould in snowdrops is an infection or disease caused by the fungus Botrytis galanthina, causing leaves and flowers to collapse. A fuzzy grey mould forms under wet conditions.

  • Take-all patch. Image: STRI

    Take-all patch

    Take-all is a fungal disease of lawns, particularly those with a high percentage of fine bentgrasses (Agrostis spp.). It causes brown patches of grass, most often in summer when the turf is under drought stress.

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