Your gardening questions answered: Should we replace our crab apple tree? via IrishTimesLife
including honey fungus, canker, scab, mildew and fireblight as well as aphids, codling moths, sawfly and capsid bugs. Judging by its purple leaves, your tree is very possibly the variety known as Malus ‘Royalty’, which is prized for its dramatically colourful leaves and dark crimson-pink spring blossom, followed in summer-autumn by lots of very decorative scarlet crab apples and then a final display of fiery autumn colour.
Apple scab is caused by a fungus known as Venturia inequalis which overwinters on fallen leaves as tiny spores and then infects the fresh, new foliage of the tree in spring, most easily in cool, wet weather. It causes blotching and spotting of the leaves, which then often fall prematurely fall in summer. The same disease also disfigures the tree’s pretty fruits, causing blotching, discolouring and cracking, and can make it more vulnerable to other destructive diseases such as canker.
Sadly there’s no cure, so my suggestion is to remove your tree and then replace it with another species of similar size, growth habit and with multiple seasons of interest.
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