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Elm leaf spot caused by Phloeospora ulmi

Scion is the leading provider of forest-related knowledge in New Zealand
Formerly known as the Forest Research Institute, Scion has been a leader in research relating to forest health for over 50 years. The Rotorua-based Crown Research Institute continues to provide science that will protect all forests from damage caused by insect pests, pathogens and weeds. The information presented below arises from these research activities.

From Scion publication An Introduction to The Diseases of Forest and Amenity Trees in New Zealand,
Forest Research bulletin 220,
G.S. Ridley and M.A. Dick 2001.

Phloeospora ulmi (Ascomycete anamorph)

Common name:

Country of origin:
Northern Hemisphere

Ulmus glabra and other Ulmus spp.

Causes irregular brown spots (Fig. 47).

Fig. 47: Irregular brown spots on Ulmus glabra caused by Phloeospora ulmi

Disease development:

NZ distribution: It is found throughout the North Island of New Zealand. Its presence in the South Island is unknown.

Economic impact:
In Europe Phloeospora ulmi is considered common but unimportant.

Control: None.

References: Ellis& Ellis 1985; Smith et al. 1988; Spaulding 1961.


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(Scion is the trading name of the New Zealand Forest Research Institute Limited.)


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