Territory Stories

Technical annual report 2000-01



Technical annual report 2000-01


Dept. of Regional Development, Primary Industry, Fisheries and Resources technical annual report; Department of Regional Development, Primary Industry, Fisheries and Resources technical and annual report; Reports; PublicationNT; Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295




Made available via the Publications (Legal Deposit) Act 2004 (NT).






Agriculture -- Northern Territory -- Periodicals; Fisheries -- Northern Territory -- Periodicals

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Dept. of Primary Industry and Fisheries

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Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295



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Department of Primary Industry and Fisheries 234 PROJECT: Survey And Control Of Class B Noxious Weeds (growth and spread to be controlled) in the Darwin Region Project Officers: S. Wingrave, M. Schmid, O. Sutter, J. Ross, M. Ashley, B. Lukitsch and B. Hitchins Location: Darwin Region Objective: To protect the NT economy, community, industries and the environment from the adverse impacts of Class B noxious weeds. Method: Extension services and weed management planning services are provided to landholders in the region for control of Class B weeds. The Minister continues to provide assistance through the Weeds Management Assistance Scheme (WMAS) and the Herbicide Subsidy Scheme. These schemes are designed to provide a financial incentive to landholders to integrate a range of control options to control mimosa and other noxious weeds. A Mimosa Management Plan has been developed for the Mary River catchment to improve strategic management of this species in the longer term. The Mimosa Management Plan has been circulated to landholders for input and its launching was planned for October 2001. Control of key infestations of mimosa along the lower Mary River continued on Melaleuca, Opium Creek, and Marrakai Stations. Strategic control of mimosa in the lower Mary River catchment is essential to prevent rapid expansion of the current mimosa problem. Other key infestations of mimosa were treated in the upper Adelaide River, Reynolds River, Finniss River and Daly River catchments. Control of isolated mimosa in the upper catchments of these river systems will ensure that mimosa management in the lower catchment of these river systems is not undermined by the reintroduction of seed in floodwaters. PROJECT: Integrated Control of Salvinia on Mission Hole Project Officers: J. Ross, G. Flanagan and B. Hitchins Location: Elizabeth Downs Station Objective: To integrate biological and chemical control in the management of Salvinia molesta on Mission Hole. Method: The bud and stem -boring weevil, Cyrtobagous salviniae, was released in 1997. The area is monitored to determine if herbicide application is necessary to provide more effective control. During 2000/2001 Salvinia molesta populations were restricted to several small isolated mats on the fringe of the billabong. Insect activity was high on the edges of the mats preventing their expansion. A small trial found that the herbicide AF101 was able to kill plants within two weeks. However, biological control agent activity meant that no herbicide applications were necessary. Wet season flushing of the billabong appears to have continued to reduce salvinia populations further.