Frost and bacterial stem canker
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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. 37, December 1994.
Recent unseasonal frosts have caused considerable damage to young radiata plantings in a number of locations around the country. There have also been more incidences in the past few months of bacterial stem canker than we have seen for some time. The bacterium Pseudomonas syringae pv. syringae periodically causes cankers and sometimes mortality of 1-2 year old trees after sudden frosts which have followed a warm, wet period. Cankers caused by P. syringae range from quite small sunken patches to large distorted resinous areas. Plant which have non-girdling cankers and which survive the initial period following infection seldom show any further deterioration. Badly cankered plants may, however, be prone to breakage at the site of the canker in the first year after infection. The incidence of bacterial stem canker around the country is very variable with no cases recorded by this laboratory in some years.
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(Scion is the trading name of the New Zealand Forest Research Institute Limited.)