Pitch canker: Risk of establishment in New Zealand based on a global perspective

Authors: Rebecca Ganley
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 2007, Issue N.Z.J.For. 52(2) 2007, pp 26-30, Aug 2007
Publisher: New Zealand Institute of Forestry

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Abstract: Fusarium circinatum is the casual agent of the disease known as pitch canker and has been considered one of New Zealand’s most undesirable and unwanted exotic forest pests. Pitch canker is present in a variety of locations worldwide. However, the behaviour of this disease varies considerably between countries, depending on the host tree species, climate, wound agents, host resistance and silvicultural practices. The risk of establishment and potential control of pitch canker in New Zealand is discussed, based on observations of this disease overseas and current literature. In the absence of intricate insect-host systems, insects currently in New Zealand are unlikely to play a significant role in disease establishment. Temperature and humidity levels would be sufficient in many areas for the establishment of pitch canker and the disease would be expected to be more severe in areas with more tropical weather conditions than regions that are colder or dryer. The effect of nutrient levels in plantations on disease establishment or severity is unclear but fertilisation would not be recommended. If detected early, F. circinatum could be eradicated.

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