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Turn over a leaf and you'll see 2mm long white flies. With a life cycle of just three weeks, whitefly breed very fast. Both adults and offspring are sap feeders and a severe attack will weaken a plant. They excrete the sticky excess, called honeydew

, and though their 'eyes' make them look quite dramatic, they are completely harmless. However, they can strip a fuchsia of its leaves at night. Active from mid- to late-summer, they can be found hiding during the day on the undersides of leaves.Thick, 8cm

pinching out the soft shoot tips with scissors, a knife or your finger nail.Repeat the pinching 2 or 3 more times, allowing two pairs of leaves to expand fully on each of the subsequent side shoots. This may take between 10 and 20 days, depending

These tiny, sap-sucking pests may be only 0.5mm long but they can wreak havoc in a greenhouse or on houseplants indoors. For most of the year they are a pale green colour with two dark spots on their back; it's only in autumn and winter