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Your gardening questions answered: Should we replace our crab apple tree?
05.08.2023 - 04:35 / irishtimes.com / Fionnuala Fallon
Q: We have a Malus (ornamental crab apple tree) in our back garden, which has grown from small to its present 20ft over 15 years. It buds and flowers nicely, but then turns a bit shabby. It doesn’t seem like a healthy tree. Can you help? We are debating whether we need to remove it and replace it. If it does need to be removed, what replacement would you suggest? CF, Co Kilkenny
A: As much as it’s a wonderful small garden tree, the ornamental crab apple is also vulnerable to various pests and diseases 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. While it’s difficult to tell from your single photo what exactly is causing the problem, I’d hazard a guess that it’s scab, which unfortunately this particular variety is especially prone to.
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 (cut it up, bag and dispose of all the wood and foliage off-site or burn
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