Gumleaf skeletonizer (GLS) and Desire: field testing the New Zealand sex pheromone lure system during a recent outbreak of GLS (Uraba lugens) in south-west Western Australia

Janet Farr *1, Allan Wills 1

1 Department of Environment & Conservation, Science Division, Brain St, Manjimup, WA 6258, Australia

In December 2009 and January 2010 an outbreak of Uraba lugens the gumleaf skeletonizer (GLS) affecting jarrah, Eucalyptus marginata, became apparent in southwest of Western Australia. By the end of January 2011 the outbreak severely affected more than 250,000 hectares of jarrah forest. The current status of this outbreak is outlined in comparison with the past outbreak in 1982-1988. In addition we tested a commercially produced pheromone lure for use in a standard delta trap system as a method for assaying populations of GLS. We report here a preliminary field trial of the New Zealand DesireĀ® GLS pheromone lure and trap system and compare trap results with larval populations determined from branch clip samples. We found that the GLS lure is highly specific for GLS in jarrah forest in southwest Western Australia. The trap and GLS lure system are effective for monitoring both outbreak and basal populations of GLS in jarrah forest with an open understory. However in locations with thick understory that exceed trap height, effectiveness is impaired.

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