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On again off again Inglisia outbreak in the Maruia valley

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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. 78, September 1998.

Inglisia outbreaks on Nothofagus fusca in the Springs Junction area are not uncommon and usually tend to follow the usual textbook 'boom and bust' type population dynamics. A recent 'outbreak' however has been unusual for its longevity. Insect numbers started to build up in the autumn of 1997 but by October and November (the usual peak population period) numbers were still only at moderate levels. This waxing and waning continued throughout last summer with numbers peaking again in the late Autumn only to drop off by August 1998. The net result of all of this has only been for the tree foliage to remain covered in the black Capnodium fungus, which grows on the sugary scale exudate. To date there has been very little of the defoliation and dieback normally associated with the more severe 'classic' outbreaks, although admittedly sampling has only been undertaken at one location.

(Paul Bradbury, MAF, Christchurch)

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