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PESTS AND DISEASES OF FORESTRY IN NEW ZEALAND

New Leafspots on Eucalyptus

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 Forest health News No.10, June 1992:

Eucalypt leafspots:
An attempt to eradicate two new fungal diseases detected at Auckland Airport during the February "port environs" survey was made in April at the behest of the Forest Health Advisory Committee (new pest/pathogen subcommittee). Supervised by MOF Protection Officer, Dave Hayes, Auckland Airport ground staff felled and burnt 3 Eucalyptus ficifolia infected with a Cladosporium sp. and 3 Eucalyptus sp. infected with an Elsinoe sp. A follow up visit in late June has revealed one eucalypt with the typical lesions of the Elsinoe sp. near where the infected trees were felled.
(Margaret Dick)

From Forest Health News No. 6, February 1992:

New Leafspots on Eucalyptus
- Torula sp. on E. bicostata at Atiamuri and E. saligna at Rotoehu. This is a circular dark brown leafspot on upper and lower surfaces of leaves and twigs.
-
Cladosporium sp. on adult foliage of 3 trees of 
E. ficifolia at Auckland International Airport. The leafspots are reddish brown to purple, 2-3 mm in size, coalescing on underside of leaf but also visible on upper surface.
- Elsinoe sp. on juvenile foliage of 3 trees of Eucalyptus sp. at Auckland International Airport. Spots are pale grey with a dark grey centre from 2-5 mm, roughly circular with an irregular dark brown margin. Spots sometimes coalesce to produce larger necrotic areas and are found on the upper leaf surface but are barely visible on the underside. Peter and Margaret insist that from a distance the leafspots are similar in colour and shape to the algal leafspot Cephaleuros virescens. NB: This Elsinoe is quite different from that associated with BRS in the central North Island.
(Monique Williams )

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

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