A canker on trees is best described as

A canker on trees is best described as

• A. A symptom of injury at a wound site infected by a fungal or bacterial pathogen
• B. An insect pest infestation
• C. A viral disease of leaves
• D. A soil microbial imbalance

Answer: (A)

A canker is a dead, sunken area on the bark or cambium of a tree that forms when a wound provides entry for fungi or bacteria. The main idea is that this condition arises from injury that becomes infected, leading to localized tissue death around the wound. Pathogens colonize the exposed tissue, produce toxins and enzymes, and kill the bark and cambium, creating the characteristic canker. This explains why the best description is a symptom of injury at a wound site infected by a fungal or bacterial pathogen. Insect pest infestations involve pests feeding or tunneling into the tree, not a wound-site infection of the bark itself. Viral diseases of leaves affect leaf tissue rather than bark cankers. A soil microbial imbalance refers to soil health issues rather than a localized infection of wounded bark.

A canker is a dead, sunken area on the bark or cambium of a tree that forms when a wound provides entry for fungi or bacteria. The main idea is that this condition arises from injury that becomes infected, leading to localized tissue death around the wound. Pathogens colonize the exposed tissue, produce toxins and enzymes, and kill the bark and cambium, creating the characteristic canker. This explains why the best description is a symptom of injury at a wound site infected by a fungal or bacterial pathogen.

Insect pest infestations involve pests feeding or tunneling into the tree, not a wound-site infection of the bark itself. Viral diseases of leaves affect leaf tissue rather than bark cankers. A soil microbial imbalance refers to soil health issues rather than a localized infection of wounded bark.