Chemical manipulation of Leptosphaeria maculans (blackleg disease) pseudothecial development and timing of ascospore discharge from canola (Brassica napus) residues

Wherrett, A. D. and Sivasithamparam, K. and Barbetti , J. (2003) Chemical manipulation of Leptosphaeria maculans (blackleg disease) pseudothecial development and timing of ascospore discharge from canola (Brassica napus) residues. Crop & Pasture Science (continuing Australian Journal of Agricultural Research), 54 (9). pp. 837-848.

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Abstract

A study was carried out to establish key developmental stages of Leptosphaeria maculans on canola residues leading up to ascospore discharge and how these stages could be affected by chemicals. The residues were dipped in a range of chemicals, including fungicides, herbicides, and surfactants, to determine possible manipulative effects of the chemicals on the development of the fungus including ascospore discharge. Treated residues were placed in the field during the growing season. Ascospore discharge was found to be closely related to pseudothecial maturity and density. There was no significant difference between pseudothecial maturation on the crown component compared with the stem component. A high correlation between rainfall and pseudothecial density suggested that rainfall was a good complimentary indicator for timing of ascospore discharge. These results may provide the canola industry with a potential method of monitoring pseudothecial development for estimating disease hazards. This would allow manipulation of sowing times so as to minimise or avoid heavy ascospore showers coinciding with the early seedling phase. ...

Item Type: Article
Additional Information: We thank the Grains Research and Development Corporation for funding this research, M. Aberra for help with field collections, and S. Marcroft for helpful discussions.
Uncontrolled Keywords: oilseed rape, teleomorph, fungicide, herbicide, surfactant.
Author Affiliation: School of Earth and Geographical Sciences, Faculty of Natural and Agricultural Sciences, The University of Estern Australia, Crawley, WA 6009, Australia.
Subjects: Plant Production
Divisions: General
Depositing User: Mr Siva Shankar
Date Deposited: 03 Jul 2012 03:32
Last Modified: 03 Jul 2012 03:33
Official URL: http://dx.doi.org/10.1071/AR03056
URI: http://eprints.icrisat.ac.in/id/eprint/6462

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