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The Royal Horticultural Society explains: "Apple canker is a disease caused by a fungus, Neonectria ditissima, which attacks the bark of apples and some other trees, causing a sunken area of dead ...
"Apple canker is a disease caused by a fungus, Neonectria ditissima, which attacks thebark of apples and some other trees, causing a sunken area of dead bark and, eventually, death of the branch.