Ecology of the pest insect jarrah leafminer (Lepidoptera) in relation to fire and timber harvesting in jarrah forest in Western Australia [Eucalyptus marginata]
1993
Abbott, I. | Van Heurck, P. | Burbidge, T. (Western Australian Dept. of Conservation and Land Management, Como)
During a period of 7 years 25 investigations of the ecology of jarrah leafminer Perthida glyphopa were carried out in relation to fire and logging of jarrah Eucalyptus marginata forest. Prescribed low intensity fires in spring or timber harvesting did not consistently favour leafminer or disfavour parasitization of its mines. Moderate intensity fire in autumn reduced the density of jarrah leafminer for 18 months. Integrating these findings with other relevant ecological and historical knowledge it is theorized that scarcity of extensive scorching of codominant crowns in jarrah forest from the mid 1950s may have facilitated the spread of the outbreak. It is recommended that more extensive autumn burning should be operationally introduced to both test the theory and subdue outbreaks of jarrah leafminer.
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