Estimating and reducing the amount of Plains-wanderer (Pedionomus torquatus Gould) habitat sprayed with pesticides for locust control in the New South Wales Riverina
Paul Story A E , Damon L. Oliver B , Ted Deveson A , Laury McCulloch A , Graeme Hamilton C and David Baker-Gabb DA Australian Plague Locust Commission, Department of Agriculture, Fisheries and Forestry, GPO Box 858, Canberra, ACT 2601, Australia.
B Biodiversity Conservation Section, Department of Environment and Climate Change, PO Box 2115, Queanbeyan, NSW 2620, Australia.
C Birds Australia, 415 Riversdale Road, Hawthorn East, Vic. 3123, Australia.
D Elanus Pty Ltd, PO Box 131, St Andrews, Vic. 3761, Australia.
E Corresponding author. Email: paul.story@daff.gov.au
Emu 107(4) 308-314 https://doi.org/10.1071/MU07055
Submitted: 18 September 2007 Accepted: 5 November 2007 Published: 7 December 2007
Abstract
The potential effects of pesticides used to control locusts in the New South Wales Riverina on the endangered Plains-wanderer (Pedionomus torquatus) have been of concern since the early 1980s. We used geographical information systems (GIS) to determine the intersection of primary and secondary Plains-wanderer habitat areas with historical locust-control data and provide estimates of the area of Plains-wanderer habitat sprayed by the Australian Plague Locust Commission for control of locusts between 1977 and 2005. Peaks among these estimates, expressed as a percentage of the identified habitat occurring on nine 1 : 100 000 map sheets within the New South Wales Riverina study area, corresponded with years of peak locust control activity, although the proportion of habitat affected was less than expected. The maximum amount of habitat exposed to pesticides occurred in 1993–94, when ~16% of primary and 12% of secondary Plains-wanderer habitat was sprayed. Locust-control protocols during 2004–05 were altered to reduce the amount of Plains-wanderer habitat sprayed with fenitrothion from 16% to 1.5%, and to increase the use of the biological control agent, Metarhizium anisopliae var. acridum (Green Guard®), over plains-wanderer habitat from 0% to 3.6%. The use of Green Guard® during future locust control within Plains-wanderer habitat in the Riverina has been recommended in the draft NSW Plains-wanderer recovery plan (New South Wales National Parks and Wildlife Service 2002).
Additional keywords: endangered species, fenitrothion, Green Guard, habitat mapping, impact assessment, locust control, Metarhizium, pesticide.
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