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  • Thuja blight

    Thuja blight

    Western red cedar (Thuja plicata) is a popular conifer, grown most commonly as hedging. Unfortunately, it can sometimes be attacked by Thuja blight, an unsightly disease of the foliage that can cause loss of vigour, particularly on young trees.

  • Fly agaric (Amanita muscaria). Credit: RHS/Herbarium.

    Toadstools

    There is no standard definition for a toadstool, and no clear distinction between toadstools and mushrooms. Both terms refer to the fruiting bodies produced by fungi. Most of these fungi are harmless or even beneficial to plants, but there are a few that can cause disease problems, such as honey fungus and the fairy ring fungi.

  • Tomato leaf mould

    Tomato leaf mould

    Leaf mould can develop rapidly to cause significant yield loss in greenhouse-grown tomatoes. It is rarely seen on outdoor crops.

  • Tomato plants affected by virus show mosaic patterns on leaves. Image: RHS, Horticultural Science

    Tomato viruses

    Many viruses affect tomatoes causing mosaic patterns on leaves, leaf distortions, stunted growth, bronzing or marbling patterns on the fruit.

  • Blossom end rot of tomato fruit. Credit:RHS/Pathology.

    Tomatoes: fruit ripening problems

    Although easy to grow and very rewarding, tomatoes can suffer from a range of easily preventable problems at the time of ripening.

  • Cracking in tomatoes is caused by fluctuating moisture levels in compost. Image: ©Garden World Images

    Tomatoes: fruit splitting and cracking

    Although easy to grow, tomato fruits can suffer from splitting and cracking in late summer. This is difficult to prevent, as it is caused by fluctuating temperatures and water supply - which are often out of the control of the gardener.

  • Magnesium deficiency shown by the tomato leaves. Credit:RHS/Tim Sandall.

    Tomatoes: leaf problems

    Although easy to grow and very rewarding, tomatoes can suffer from a range of easily preventable leaf problems.

  • Verticillium wilt on tomato. Credit: RHS/Pathology.

    Tomatoes: stem problems

    Although easy to grow and very rewarding, tomatoes can suffer from a range of problems with their stems, from the lumps and bumps of root initials to more serious stem rots caused by a variety of diseases.

  • ©RHS PUB0013784

    Tortrix moth caterpillars

    These moth caterpillars bind leaves together with silky threads and feed inside. They can affect a range of plants and in a glasshouse can cause damage throughout the year.

  • Trachelospermum jasminoides. Image: RHS Herbarium

    Trachelospermum

    With its scented jasmine-like flowers, Trachelospermum is often known as star jasmine. Its evergreen foliage makes it an excellent climber for a sunny, sheltered spot in mild regions of the UK. Elsewhere, it can be grown under cover of a greenhouse or conservatory.

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