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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 240 Two species of seed feeding weevils continue to be released on the Finniss River. Field recovery of Chalcodermus serripes occurred and the laboratory-rearing program of adults has increased. The molecular analysis of a Wet season fungal pathogen, Phloeospora mimosae-pigrae is continuing to determine a more suitable isolate for further field releases. Closely related fungi are also identified by phylogentic studies that will support the prediction of potential behaviour pattern of Phloeospora in the field. The Dry season rust fungus, Diabole has reappeared at release sites after the initial inoculation in 1998. The rust has gone dormant in liquid nitrogen storage, and trials to break the dormancy have commenced. Studies on efficient culturing technique and further field releases will resume after a viable culture has been reestablished. Mass rearing for the new mimosa root and leaf-feeding beetle, Malacorhinus, has commenced. The first newly emerged adults have been collected and a release program is being developed. PROJECT: The Integration of Biological Control of Mimosa and Other Control Options Project Officers: B. Hennecke, G.Flanagan, M. Paskins, S. Gall, B. Hitchins, N. Ostermeyer and N. Graham Location: Darwin Region Objective: To determine the most cost-effective method of integrating biological control, herbicides, mechanical control, fire and revegetation into a mimosa management program Method: The integrated control research aims to determine the impact on mimosa of various mechanical and chemical control methods, individually and in combination. In particular, the interaction of these control methods with biological control is being investigated. A significant result from this years program is the finding that the abundance of key biological control agents on mimosa is greater in plots that have received prior chemical or mechanical control treatments. This is an exciting result, and augurs well for the development of a sustainable integrated management strategy for mimosa. PROJECT: Biological Control of Sida Project Officers: N. Ostermeyer, S. Gall, M. Paskins, B. Hennecke and G. Flanagan Location: Darwin Region Objective: To protect the NT economy, community, industries and environment from the adverse impacts of Sida acuta. Background: Three insects have been released for the biological control of Sida acuta: the leaf feeding beetle, Calligrapha pantherina, in 1989; the stem-boring weevil Eutinobothrus sp. in 1994; and another stem boring weevil E.