Cytospora canker is described as which of the following?

Cytospora canker is described as which of the following?

• A. Once applied as a systemic, these chemicals frontal fungi that have already entered the plant.
• B. A milky white amber droplet of bacterial ooze that may exude from plant parts. Cambial tissue is killed in the region of the canker and will be brown to black.
• C. The primary host of a Colorados Blue Spruce.
• D. A rust disease on conifers.

Answer: (C)

Cytospora canker is a fungal disease of conifers that commonly affects spruce trees, with Colorado blue spruce being a well-known susceptible host. The statement that points to a host relationship—specifically Colorado blue spruce—as the description aligns with how this disease is observed in the field: a pathogen-specific canker disease that concentrates on spruce hosts. The other options describe conditions that don’t match Cytospora canker: bacterial ooze, a rust disease on conifers, or a vague/systemic chemical description. In practice, Cytospora canker presents as sunken cankers on branches and trunks of stressed spruces and is caused by Cytospora species, not bacteria or rust fungi.

Cytospora canker is a fungal disease of conifers that commonly affects spruce trees, with Colorado blue spruce being a well-known susceptible host. The statement that points to a host relationship—specifically Colorado blue spruce—as the description aligns with how this disease is observed in the field: a pathogen-specific canker disease that concentrates on spruce hosts. The other options describe conditions that don’t match Cytospora canker: bacterial ooze, a rust disease on conifers, or a vague/systemic chemical description. In practice, Cytospora canker presents as sunken cankers on branches and trunks of stressed spruces and is caused by Cytospora species, not bacteria or rust fungi.