Pre-emptive control of four persistent forage legumes in grassland environments in Queensland – a case study of an evolving eradication program

Cox, Kendrick, Clem, Bob, Hall, Trevor, Hilder, Terry, Keating, Mark, Silcock, Richard, Gardiner, Christopher, and McDonald, Cam (2007) Pre-emptive control of four persistent forage legumes in grassland environments in Queensland – a case study of an evolving eradication program. In: Proceedings of the 9th Queensland Weed Symposium , pp. 153-157. From: Proceedings of the 9th Queensland Weed Symposium , 3-6 June 2007, Surfers Paradise, QLD, Australia.

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Abstract

A mid-program review of the progress and evolving challenges of a forage legume plant eradication program is presented. The target plants include ecotypes of four perennial and hardseeded legumes well-adapted to various; but extensive areas of Queensland: Acacia angustissima, Aeschynomene brasiliana, Aeschynorriene paniculata and Indigofera schimperi. These were 'assessed and later rejected as potential pasture plants during the 1980s and 1990s during which time seed~producing populations established. A two-phase plant,eradication program was undertaken at 66 locations throughout Queensland between 1999 and 2006. Once detected by regular ground surveys, plants were killed prior to flowering using selective herbicides, manual action, cultivation, controlled grazing and fire. By January 2006 the target plants were contained to original plant locations, emergent plant populations had declined and seeding was prevented at most sites. However, dormant persistent seed populations at most sites prompted extension of the program. At 6 sites larger and more mobile populations of the Aeschynomene ecotypes showed potential for escape from control areas, risking an escalation in resources required for long-term control. Additional activity and funding was necessary at these sites. Knowledge developed during the program was evolutionary, resulting in considerable shifts in strategic approach, scope and funding not perceived at the beginning of the program. Evolving challenges include demonstration of progress to investors, delimitation and predicting long term needs and funding.

Item ID: 8317
Item Type: Conference Item (Presentation)
Keywords: eradication; delimitation; legumes; Queensland
ISSN: 1834-7460
Date Deposited: 24 Feb 2010 05:39
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050209 Natural Resource Management @ 100%
SEO Codes: 96 ENVIRONMENT > 9604 Control of Pests, Diseases and Exotic Species > 960413 Control of Plant Pests, Diseases and Exotic Species in Farmland, Arable Cropland and Permanent Cropland @ 100%
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