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Left unchecked, canker can gradually spread to affect whole branches and sections of trees. Severely-infected old trees may be beyond rescue, while young trees are vulnerable to infection, particularly where other susceptible trees are growing

A general term for disease that's characterised by patches of dead cells on the trunk or branches of a tree or woody plant. Also see Anthracnose.

Bacterial canker affects ornamental and edible Prunus species, including cherries, plums and apricots. Monty demonstrates effective techniques for pruning out infected stems, in his practical video guide.spring-summerMore problem-solving advice

A general term (also see Canker) covering a large number of plant diseases sharing similar symptoms, namely patches of dead tissue on leaves or stems. These are caused by a range of organisms, including fungi, bacteria, mycoplasmas and viruses.

Apple sooty blotchApple sawflyApple and pear scabCanker on apples trees

, such as canker, can set in.Congregations of fluffy, white, waxy aphids cause localised swellings on branches. If the swellings split open in winter, infections can set in.Blast off the fluffy, sticky aphid mass with a high-speed jet of water. This won't cure

of ornamental shrubsCankerEuonymus scaleLeaf miner flyHorse chestnut scale insect

in midsummer.horse chestnuts, magnolias, cornus, bay, lime and acer trees. May-SeptemberMore common apple and pear trees problemsCankerEuonymus scaleLeaf miner flyViburnum beetle

with pests and diseases.Caring for your apple treesPreventing apple and pear scab.Combatting apple sawfly.Treating apple sooty blotch.Dealing with canker.Choose fruit varieties to grow in your gardenBrowse our collection of deciduous trees