a group of fungal diseases that affect a variety of plants in warm. humid areas. caused by certain fungi. Symptoms include sunken spots or lesions (blight) of various colors in leaves. stems. fruits. or flowers. and some infections form cankers on twigs and branches. Causes wilting. withering. blotching or necrosis of tissues. and can lead to the death of an infected plant.
Canker generally refers to many different plant diseases of such broadly similar symptoms as the appearance of small areas of dead tissue, which grow slowly, often over years. Some are of only minor consequence, but others are ultimately lethal and therefore of major economic importance in agriculture and horticulture. Their causes include such a wide range of organisms as fungi, bacteria, mycoplasmas and viruses. The majority of canker-causing organisms are bound to a unique host species or genus, but a few will attack other plants. Weather and animals can spread canker, thereby endangering areas that have only slight amount of canker.