Small, roughly circular lesions on the green stems of several eucalypt species (dubbed 'measles' by some eucalypt growers) have aroused some interest of late. Several samples, particularly of Eucalyptus nitens , have found their way to the laboratory for examination. The lesions are usually quite shallow and a proportion will disappear altogether as the bark begins to flake and peel away. Others remain visible but the dead tissue does not penetrate sufficiently far into the stem to pose a problem. Several different fungi can be isolated from such lesions but the most common is Cytospora eucalypticola.

Type: Caulicolous Fungi; Description: Conidiomata stromatic, pycnidial, uni- or multi-loculate, scattered, immersed, forming raised pustules in vertical rows just below the epidermis, finally erumpent through longitudinal cracks in the bark, subglobose, black, 0.2–0.8 mm in diameter, ostiole papillate; on branches. Conidia sausage-shaped, 0-septate, 3–4 × 1 μm, smooth, hyaline; exuded in pale yellowish slimy globules.

Distribution: Bay of Plenty, Taupo, Wellington, Hawkes Bay.; 1st Record: Dick (1998).

Significance: Associated with dieback and cankering of branches. Lesions are generally superficial and the fungus is regarded as a weak pathogen causing little damage (Dick 1998).; Host(s): Eucalyptus grandis, E. nitens.