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PESTS AND DISEASES OF FORESTRY IN NEW ZEALAND


 Thaumastocoris, bronze bug


Thaumastocoris, a eucalyptus pest now present in New Zealand
 

Bronze Bugs on the move
Forest Health news 276, October 2017

UPDATE ON THE SPREAD OF BRONZE BUG IN NEW ZEALAND
Forest Health News 256, May 2015

UPDATE ON THE SPREAD OF BRONZE BUG IN AUCKLAND
Forest Health News 238, July 2013

DISTRIBUTION AND HOST LIST FOR THAUMASTOCORIS PEREGRINUS
Forest Health News 233, February 2013

A NEW EUCALYPT PEST HAS ARRIVED IN NEW ZEALAND: BRONZE BUG
Forest Health News 226, June 2012

BRONZE BUG, THAUMASTOCORIS PEREGRINUS: A NEW EUCALYPTUS PEST IN NEW ZEALAND
Surveillance Volume 39, No. 2 June 2012

This serious pest of Eucalyptus has in recent times also been found in Italy, South Africa and Argentina, and originates from Australia.

Thaumastocoris peregrinus and T. australicus are small (2-4 mm) sap-sucking insects. They originate from Australia and kill the leaves of Eucalyptus reducing the trees photosynthetic ability. The lack of food results in stunted growth and even death of severely infested trees.
The foliage on a tree infested with Thaumastocoris is usually seen to turn a deep red/brown, starting at the northern side of the canopy, but progressively spreading to the entire canopy. This is sometimes referred to as “winter bronzing” and/or “winter die-back”. Although this phenomenon occurs throughout the year, the bronzing of leaves usually appears during high infestation levels of Thaumastocoris. The tree may, however, appear to recover when the Thaumastocoris population is reduced when unfavourable conditions for their survival occur.

It was first reported in South Africa in 2005 and Argentina in 2006. Now present in Italy and New Zealand
 

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