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Integrated shrub management in semi-arid woodlands of eastern Australia: ground and aerial application of defoliant to shrubs regenerating after disturbance

Noble, J C; Muller, W J; MacLeod, N D; Bodulovic, Z; Jones, Peter G; Wood, Jeffrey

Description

This paper describes experiments undertaken at several sites in semi-arid woodlands of eastern Australia to determine if chemicals applied either on the ground or from the air reduce the density of shrubs regenerating after disturbance. Ground-spraying of RoundupĀ® in the autumn was more effective than spring application in defoliating shrubs, especially 2-year-old coppice growth. Spraying of Roundup with a hand-held boom at 0.5 up to 2.5 kg glyphosate/ha identified rates to be used for boom...[Show more]

dc.contributor.authorNoble, J C
dc.contributor.authorMuller, W J
dc.contributor.authorMacLeod, N D
dc.contributor.authorBodulovic, Z
dc.contributor.authorJones, Peter G
dc.contributor.authorWood, Jeffrey
dc.date.accessioned2015-12-13T22:43:24Z
dc.date.available2015-12-13T22:43:24Z
dc.identifier.issn1036-9872
dc.identifier.urihttp://hdl.handle.net/1885/79192
dc.description.abstractThis paper describes experiments undertaken at several sites in semi-arid woodlands of eastern Australia to determine if chemicals applied either on the ground or from the air reduce the density of shrubs regenerating after disturbance. Ground-spraying of RoundupĀ® in the autumn was more effective than spring application in defoliating shrubs, especially 2-year-old coppice growth. Spraying of Roundup with a hand-held boom at 0.5 up to 2.5 kg glyphosate/ha identified rates to be used for boom spraying. Aerial spraying experiments were then undertaken across several sites and involved several target species. The location of sufficiently large areas where shrub regeneration was of an optimum age (i.e. about 2-3 years) proved to be extremely difficult due to prevailing drought conditions precluding the use of prescribed fire as a preliminary treatment. Nonetheless in one experiment, young (1-year-old) regrowth of firebush (Senna pleurocarpa) exhibited increased sensitivity to Roundup with significant shoot mortality recorded after it had been applied at 0.5kg glyphosate/ha. Aerial spraying based on an ultra-low volume application of 10L/ha further enhanced cost-effectiveness on this occasion. Economic analyses structured around 20-year partial budgeting and determination of net present value (NPV) suggested a profitable return could be expected where treatment was based on Roundup applied at this threshold rate 2 years after a prescribed fire, especially when the rehabilitation costs were spread over an entire paddock that had been only partially sprayed. Finally, operational aspects involving aerial spraying in these semi-arid woodlands are also discussed.
dc.publisherAustralian Rangeland Society
dc.sourceThe Rangeland Journal
dc.subjectKeywords: Croton lucidus; Senna; Senna pleurocarpa Adjuvants; Arboricides; Coppice age; Economics; Glyphosate
dc.titleIntegrated shrub management in semi-arid woodlands of eastern Australia: ground and aerial application of defoliant to shrubs regenerating after disturbance
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume27
dc.date.issued2005
local.identifier.absfor060799 - Plant Biology not elsewhere classified
local.identifier.ariespublicationMigratedxPub7686
local.type.statusPublished Version
local.contributor.affiliationNoble, J C, CSIRO Division of Sustainable Ecosystems
local.contributor.affiliationMuller, W J, CSIRO Mathematical and Information Sciences
local.contributor.affiliationMacLeod, N D, CSIRO Division of Sustainable Ecosystems
local.contributor.affiliationBodulovic, Z, Agtech Pty Ltd
local.contributor.affiliationJones, Peter G, QLD Department of Primary Industries and Fisheries
local.contributor.affiliationWood, Jeffrey, Administrative Division, ANU
local.bibliographicCitation.startpage117
local.bibliographicCitation.lastpage134
local.identifier.doi10.1071/RJ05010
dc.date.updated2015-12-11T10:12:07Z
local.identifier.scopusID2-s2.0-28044440638
CollectionsANU Research Publications

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