The pathogen causes small, necrotic spots on the young green stems of Eucalyptus, which later coalesce and form large cankers that eventually girdle susceptible trees and kill its top (Wingfield et al. 1997). Abundant kino exudation and formation of kino pockets in the xylem are caused by the disese (Gezahgne et al. 2003). The lesions restrict bark peeling prior to pulping (Roux et al. 2002).
The fungus:
Pycnidia single or aggregated, 2—15 µm in diameter, globose or depressed, 60—120 µm wide, exuding spores in dark brown masses; Conidiogenous cells annellidic, pale brown, smooth, doliiform to reinform, 4-8 x 2.5—3.5 µm. Conidia medium brown, thick-walled, smooth to verruculose, broadly ellipsoid, apex obtuse, base subtruncate to bluntly rounded, mostly 4.5—5 x 2—2.5 µm. Spermatia hyaline, rod-shaped, 3—4 x 1.5—2 µm (Wingfield et al. 1997).
Note: Additional information is given by Wingfield et al. (1997) and Van Zyl et al. (2002ab).
