Journal article

Detection, prevalence and severity of upper canopy infection on mature Brassica napus plants caused by Leptosphaeria maculans in Australia

Susan J Sprague, Stephen J Marcroft, Kurt D Lindbeck, Andrew H Ware, Ravjit K Khangura, Angela P Van de Wouw



Blackleg, caused by Leptosphaeria maculans, is the main disease constraint for canola production in Australia. The fungus infects all aboveground and belowground parts of the canola plant. Yield loss in Australia and worldwide is generally associated with cankers at the crown, which arise from leaf infections during the early stages of seedling growth. Infection of flowers, peduncles, siliques, main stems and branches, with resultant lesions and canker formation, are typically uncommon symptoms. We propose the term 'upper canopy infection' to encompass symptoms on all of these plant parts because they generally occur together on the same plant and appear after the plant has undergone elongat..

View full abstract

University of Melbourne Researchers


Funding Acknowledgements

We acknowledge the Grains Research and Development Corporation for funding the research presented in this study. The authors gratefully acknowledge the assistance of Dr Julianne Lilley and Laura Goward (CSIRO Agriculture and Food, Canberra) for assistance with the APSIM-Canola model. We thank the numerous growers who generously hosted the disease monitoring sites associated with NVT. We also thank Rod and Bev Kershaw of 'Iandra', Greenethorpe NSW.