BBC Gardeners' World

Problem solving

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  Phormium mealybug

  White, waxy deposits appear on phormium leaves.

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  Pollen beetles

  Small bronze-green shiny beetles on flowers.

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  Powdery mildew

  A white powder coating covers the leaves of shrubs.

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  Primula leaf spot

  Primula leaves have spots and are fringed yellow or orange.

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  Red spider mite

  Fine webbing on leaves of indoor and outdoor plants.

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  Reversion

  Variegated plants start growing all-green leaves.

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  Rhododendron leaf spot

  Brownish-purple spots form on rhododendron leaves.

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  Rose rust

  Orange spots on rose leaves, followed by black pustules.