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PESTS AND DISEASES OF FORESTRY IN NEW ZEALAND

Symptoms observed in November, tree age from six to fifteen years

Close up of needles showing brick red bands and black fruiting bodies within the bands where spores are released

Dothistroma needle blight occurs all year, but first appears on current foliage about December.

Needles

Brick red bands on green needles with black spots usually seen within the bands. Needles die completely and are retained. Needles may wilt, but usually wither and turn brown/grey.

Incidence and severity

General distribution, almost every tree in affected parts, but tree to tree variation is apparent.

 

Stages of Cyclaneusma needle cast development (starting on right hand needle) from green to yellow to brown with transverse stripes developing on far left needle

Cyclaneusma needle cast occurs from September to November. Symptoms are seen on trees from six to twenty years.

Needles

Yellow, then gold, then brown. Needles detach very readily. No needle wilt.

Incidence and severity

Scattered individuals, up to 90% severity on very susceptible trees.

 

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