The second most common diseases, apple and pear scab, are also highly contagious fungal diseases. This disease is caused by ...

Gardeners who have apple or pear trees are being urged to inspect ... According to the Royal Horticultural Society: "Apple canker is a disease caused by a fungus, Neonectria ditissima, which ...

The decay is caused by a fungus that attacks the tree's bark, with apple and pear trees being the most common hosts. If not addressed, canker can kill a tree in a single season and spread to others.