Take a look at some of the common problems you might encounter on an apple tree.
Bitter pit. This disorder is caused by low levels of calcium in the fruit. Spray fruits with calcium nitrate from early spring to early autumn.
Brown rot. Brown spots appear and enlarge to cover the apple. Remove damaged fruit and do not compost the mummified fruits (as shown here).
Brown rot. This can develop on the tree as well as in store. Remove infected fruits promptly to prevent it spreading to nearby apples.
Capsid bug. This pest causes bumpy blemishes, but they only affect the quality of the
Caterpillar damage. Damage to the fruits happens in spring and results in depressions in the fruits. Examples include winter moth caterpillar.
Cracking of the skin. Usually caused by heavy rains after a dry period. This results in the fruit expanding and breaking the skin of the fruit.
Codling moth. The cause of maggoty apples. In early summer, hang pheromone traps to monitor the pest and spray when present.
Frost damage. Frost can kill the blossom and small fruitlets. Other apple fruits may develop a ring of russetting around the eye-end of the fruit.
Rosy apple aphid. The aphids feed on the fruitlets in spring, causing stunted fruits.
Russetting. This is normal for some apple cultivars, such as ‘Egremont Russet’, although frost can cause areas or rings of russetting (see frost damage).
Apple sawfly. Damage to the fruitlets caused by apple sawfly can result in a ribbon scar on the mature fruit. Pick off and destroy damaged apples.
Apple scab. A fungal disease that causes circular patches on the skin. These lesions are an entry point for brown rot. Control by spraying and raking up the leaves.
Apple canker is a fungal disease causing disfiguring and sunken patches of dead bark on the branches of apple and some other trees. Infections often begin at wounds or buds.