Dutch Elm Disease - Ophiostoma

Vascular Wilts

Dutch Elm Disease - Ophiostoma

conidia of Ophiostoma

Sporothrix stage. Conidiophores producing conidia


Synnemata on elm bark as viewed with a hand lens.

Synnemata under microcope

Microscopic view of a synnema.


Enlarged area of the top of the synemma showing many conidiophores producing conidia. The conidia accumulate in a sticly droplet on the synemma.


Perithecia (note bulbous base).

Perithecia under microscope

Perithecia as seen through the microscope.