BBC Gardeners' World

Problem solving

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  Magnesium deficiency

  Yellow leaves on plants, particularly fruit & veg.

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  Mildew on cucurbits

  White powder on leaves of courgettes and squashes.

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  Moles

  Piles of soil on lawns, and underground tunnels in soil.

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  New Zealand flatworms

  Large worms that eat our native earthworms.

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  Pea and bean weevils

  U-shaped holes on edges of broad bean and pea leaves.

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  Potato blight

  Potato leaves turn brown and die, and tubers rot.

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  Powdery mildew

  A white powder coating covers the leaves of shrubs.

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  Reversion

  Variegated plants start growing all-green leaves.