Canker Diseases - Conifers
Shoot dieback caused by Diplodia sapinea on a campus tree. These infections started after a drought that occurred a few years ago.
Shoot blight on pine. Shoots are susceptible to infection at bud break in the spring.
Diplodia can also cause cankers on branches and the main stems of pine. The fungus enters wounds and is most severe after drought periods.
Pycnidia at base of needles produce conidia.
Pycnidia are also produced on a cones.
Higher magnification of pycnidia on cone.
A scale from an older pine cone showing lots of pycnidia.