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Dothistroma pine needle blight

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 206, June 2010.

Dothistroma (septosporum) (= D. pini) is a needle blight that affects the health and growth of pine trees. Each summer, affected forests around New Zealand are aerially sprayed with a copper fungicide to control the disease.

Dothistroma on Pinus radiata.

The Dothistroma Control Committee (DCC), a subcommittee of the NZ Forest Owners’Association Inc (NZFOA), coordinates this spray programme on behalf of all forest owners. The Committee is concerned that forest owners or managers of small blocks may overlook the presence of the disease in their forests until serious damage to the stands has occurred. In addition, untreated stands create a source of infection to neighbouring forests.

The Committee’s services are available to all forest owners - large or small, to ensure the best control of the disease in the most cost effective manner.

The DCC purchases bulk supplies of copper fungicide at competitive rates on the world market, purchases spray oil and contracts aerial application of the spray.

The Committee, which is non-profit making, is also responsible for monitoring the programme and reviewing new research and developments that might improve the programme. The DCC members are from major forest growers, Farm Forestry Association and Scion.

In order to ensure that the most competitive flying rates are received, the Committee requires requests for spraying to be made by mid-August of each year.

If assistance is required to assess levels of infection, you should contact one of the NZ Forest Owners’Association approved Forest Health Surveyors, a Registered Forestry Consultant, or someone trained in Dothistroma assessment.

Forest owners are urged to act promptly so that their forest can be scheduled on the work programme for this season. For enquiries or assistance with spray programmes contact:

The Secretary, Dothistroma Control Committee, PO Box 1035, ROTORUA
Phone: (07) 3323454; or mobile (0274) 885940

Don Hammond (

This information is intended for general interest only. It is not intended to be a substitute for specific specialist advice on any matter and should not be relied on for that purpose. Scion will not be liable for any direct, indirect, incidental, special, consequential or exemplary damages, loss of profits, or any other intangible losses that result from using the information provided on this site.
(Scion is the trading name of the New Zealand Forest Research Institute Limited.)


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