Canker

Canker is a general terms for a large number of different plant diseases, characterised by broadly similar symptoms including the appearance of small areas of dead tissue, which grow slowly, often over a period of years. Some are of only minor consequence, but others are ultimately lethal. Different cankers and anthracnoses are caused by a wide range of organisms, including fungi, bacteria, mycoplasmas and viruses.

Canker commonly refers to:
 * Bacterial canker of tomato (Clavibacter michiganensis ssp.michiganensis)
 * Parsnip canker (Itersonilia pastinacae)

Canker may also refer to:
 * Rhizopus canker, commonly known as rhizopus soft rot (Rhizopus stolonifer)