BBC Gardeners' World

Problem solving

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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 blackspot

  Dark spots on rose leaves, which later drop off.

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  Rose bloom balling

  Rosebuds develop but fail to open, and finally drop off.

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  Rose leaf rolling sawfly

  Leaves nearest buds on roses curl up, then appear skeletal.

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  Rose powdery mildew

  White powdery coating on leaves and buds of roses.

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  Rose rust

  Orange spots on rose leaves, followed by black pustules.

How to

keep new and established plants well fed