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  • Narcissus eelworm

    Stem and bulb eelworm

    Many gardeners look forward to a spring display of bulbs, unfortunately the bulbs do not always give the expected display. One possible cause for failure is Ditylenchus dipsaci the stem and bulb eelworm which can cause poor growth and death in a wide range of plants, not just bulbs.

  • Strawberry 'Pegasus'. Image: Graham Titchmarsh/RHS

    Strawberries

    Strawberries are easy to grow, and even a few plants can give a plentiful supply of sweet succulent fruits in summer, which are especially appreciated by children. 

  • Strawberry black eye. Credit: RHS/Tim Sandall.

    Strawberry black eye

    Black eye is the most recognisable form of frost damage on strawberries. Affected flowers will not set fruit.

  • Strawberry viruses

    Strawberry viruses

    Several viruses and phytoplasmas (which have characteristics in common with both viruses and bacteria) infect strawberries to cause a wide range of symptoms which result in poor vigour and low yield.

  • Sweet pea leaf with virus. Image: RHS, Horticultural Science

    Sweet pea viruses

    Many viruses affect Lathyrus spp. (sweet peas) causing streaked flowers, mottled leaves, stunted growth and dead patches on leaves.

  • ©RHS SCN0006265

    Swift moth caterpillars

    Swift moth caterpillars are dirty-white with brown heads they live in the soil and can feed on plant roots and at the base of plant stems, causing plants to collapse.

  • 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.

  • Tar spot of maple

    Tar spot of maple

    Tar spot is a very conspicuous fungal leaf spot disease of sycamore and some other maples. Whilst the large leaf spots sometimes cause gardeners concern, they actually do very little damage to the tree.

  • Creeping thistle

    Thistle: creeping

    Creeping thistle can quickly spread in grassland areas and borders. Once established, it can be difficult to eradicate permanently. You may find that repeated digging out of roots reduces the problem, but chemical control will provide a quicker solution.

  • ©RHS SCN0006219

    Thrips

    Several species of thrips can cause a mottling on foliage and flowers of a wide range of garden and glasshouse plants.

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