Non chemical control
Canker is said to be more serious on wet, heavy and/or acid soils, so pay attention to drainage and raise the soil pH by liming if needed.
Completely cut out all affected smaller branches and spurs. With the larger branches, try to cut out all infected material. All such pruning should remove all brown, infected bark and wood, cutting back to fresh green tissues. Paint immediately with a protective wound paint such as Medo, Prune and Seal or Arbrex Seal and Heal, to prevent the wounds becoming reinfected.
No variety is completely resistant under all conditions, but the following all show some resistance: ‘Alfriston’, ‘Annie Elizabeth’, ‘Brownlees Russet’, ‘Cockle Pippin’, ‘Crawley Beauty’, ‘D’Arcy Spice’, ‘Emneth Early’, ‘Grenadier’, ‘John Standish’, ‘Katy’ (‘Katya’), ‘Lane’s Prince Albert’, ‘Lord Derby’, ‘Merton Russet’, ‘Newton Wonder’, ‘Orleans Reinette’, ‘Reverend W. Wilkes’, ‘Rosemary Russet’, ‘Winston’.
Some varieties are particularly susceptible to canker and these include ‘Cox’s Orange Pippin’, ‘Lord Suffield’, ‘James Grieve’, ‘Ribston Pippin’, ‘Worcester Pearmain’, ‘Ellison’s Orange’ and ‘Spartan’.
Spray with the copper-containing fungicides Bordeaux Mixture (Vitax)* or Fruit and Vegetable Disease Control (Bayer Garden)*, once after picking but before leaf fall and a second time when about half the leaves have fallen.
*NB: The following products are being withdrawn:
Bordeaux Mixture (Vitax) is being withdrawn and cannot be sold after the 30th November 2014 and remaining stocks must be used or disposed of before the 30th November 2015.
Copper oxychloride (Bayer Garden - Fruit and Vegetable Disease Control is being withdrawn and cannot be sold after the 30th November 2014 and remaining stocks must be used or disposed of before the 30th November 2015.
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)