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PESTS AND DISEASES OF FORESTRY IN NEW ZEALAND


Small Forests & Woodlots

A guide to conducting forest health assessments and sampling:

OVERALL TREE HEALTH and FORM

Double leader and 'hedging' caused by boron
deficiency on a three year old Pinus radiata seedling.

A number of pests and nutrient deficiencies affect tree form. Periodic dieback or lesions due to insect attack or pathogens can also cause poor form or stem/wood defects. This despite outwardly appearing healthy with good colour and foliage retention.

Generally, any loss of apical dominance in plantation species tree is not normal or desired, so it is important to get to the bottom of what is causing poor tree form.

Cypress canker Seridium sp.
resulting in stem defects to a
Cupressus lusitanica.
Repeated leaf miner damage
Acacia melanoxylon tips results in hedging and multi-leadered trees.
Multi-leader of a 10 year old Pinus radiata caused by the wound pathogen Diplodia pinea.

 


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