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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 194 PROJECT: Northern Cotton Disease Survey Project Officer: S. Bellgard Location: Katherine Research Station Objective: Develop Sustainable Cotton Farming Systems. Method and Result: Northern Cotton Disease Survey With the expected expansion of cotton cultivation in the NT and in the north of WA, it is essential to identify potential diseases that may threaten commercial production. Emphasis was placed on populations of naturalised and volunteer cotton on roadsides and riversides. Visits were made to trials of commercial cotton varieties in Katherine and Kununurra. Tropical rust, caused by Phakopsora gossypi, was observed in all naturalised cotton populations, but not in the commercial cultivars in KRS. None of the cotton had symptoms of vascular wilts and/or black root-rot, which are caused by Thielaviopsis basicola. Leaf Spot Research Incidence of leaf spot disease, which is caused by Alternaria species, was compared between irrigation treatments and 20 cultivars. Leaf spot occurred early in the life of the crop in both drip-tape and overhead irrigation. However, in the long-term, leaf spot disease pressure was consistently greater in the overhead irrigated cotton. All commercial cultivars exhibited some susceptibility to leaf spot. The most susceptible lines were Sicot 51i and 53i. Mycorrhizal Research Cotton is a mycotrophic plant in which growth and nutrient uptake is usually increased by their mycorrhizal partnerships with beneficial soil fungi. Best Practice soil conservation management practices are part of our cotton farming system. Impacts of conventional tillage have begun to be investigated, as well as the variation in seasonal spore numbers of the beneficial soil fungi. This work has been supported in part by a Cotton CRC scientific exchange, which made it possible to host Professor Stephen E. Williams from the Department of Renewable Resources, University of Wyoming. PROJECT: Disease Diagnostic Service - Darwin Project Officers: B. Cond, R. Pitkethley, A. Daly, L. Ulyatt and I. Arao-Arao Location: Darwin Objective: To provide a plant disease diagnostic service for primary producers and the public. Background: The plant disease diagnostic service is a core function of the Plant Pathology Branch. The status of this service was elevated when DPIF became a core partner in the Cooperative Research Centre for Tropical Plant Protection and became involved in a major project initiative, the Northern Australian Diagnostic Network (NADN). The Darwin and Katherine plant disease diagnostic facilities together form a node of this network.