Identification of Leptosphaeria biglobosa ‘canadensis’ on Brassica juncea stubble from northern New South Wales, Australia

Angela P. Van de Wouw; Vicki L. Thomas; Anton J. Cozijnsen; Stephen J. Marcroft; Phillip A. Salisbury; Barbara J. Howlett

doi:10.1071/DN08049

RESEARCH ARTICLE

Identification of Leptosphaeria biglobosa ‘canadensis’ on Brassica juncea stubble from northern New South Wales, Australia

Angela P. Van de Wouw ^A ^E , Vicki L. Thomas ^B , Anton J. Cozijnsen ^A , Stephen J. Marcroft ^C , Phillip A. Salisbury ^B ^D and Barbara J. Howlett ^A

+ Author Affiliations

- Author Affiliations

^A School of Botany, The University of Melbourne, Vic. 3010, Australia.

^B Faculty of Land and Food Resources, The University of Melbourne, Vic. 3010, Australia.

^C Marcroft Grains Pathology P/L, Grains Innovation Park, Horsham, Vic. 3400, Australia.

^D Department of Primary Industries, VABC, Bundoora, Vic. 3083, Australia.

^E Corresponding author. Email: apvdw2@unimelb.edu.au

Australasian Plant Disease Notes 3(1) 124-128 https://doi.org/10.1071/DN08049
Submitted: 13 June 2008 Accepted: 3 September 2008 Published: 18 September 2008

Abstract

Leptosphaeria biglobosa ‘canadensis’ is reported for the first time in Australia. All 88 Leptosphaeria isolates cultured from Brassica juncea stubble from northern NSW were L. biglobosa ‘canadensis’ whilst all 55 isolates cultured from Victorian stubble of the same B. juncea lines were L. maculans. Both L. biglobosa ‘canadensis’ and L. maculans formed similar sized lesions on B. juncea cotyledons after 14 days. However, L. biglobosa ‘canadensis’ isolates colonised stems less effectively than L. maculans and consequently caused less crown cankering.

Acknowledgements

We thank the Grains Research and Development Corporation, Australia for funding. We also thank Paul Parker and Rod Bambach from the New South Wales Department of Primary Industries for the collection of stubble.

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