New host resistances to Pseudocercosporella capsellae and implications for white leaf spot management in Brassicaceae crops

N. Gunasinghe, Mingpei P. You, X.X. Li, S.S. Banga, S.K. Banga, Martin J. Barbetti

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

© 2016 Elsevier Ltd. Effective host resistance is the most cost-effective long term prospect for successful management of white leaf spot disease (Pseudocercosporella capsellae) in Brassicaceae. In two separate field trials, 168 genotypes were screened. In the first trial, lines of Brassica oleracea var. capitata (59), Brassica napus (34), Brassica juncea (6) and B. juncea containing wild weedy Brassicaceae introgression(s) (14) were arranged; and in the second, Australian historic and current B. napus (45) and B. juncea (10) varieties were screened. There was wide variation in expression of resistance, from complete resistance to highly susceptible as assessed by two disease parameters, viz. (i), Area Under Disease Progress Curve (AUDPC) for percent leaves diseased (values 0-221.2) and (ii) Percent Leaf Collapse Index (%LCI) values for leaf collapse due to disease (0-38.7). Brassica oleracea var. capitata was overall the most resistant species, while B. juncea the most susceptible with the majority having AUDPC values >75 and B. napus was intermediate. Five B. oleracea var. capitata genotypes were completely resistant, with 0 AUDPC and %LCI values. Pioneer® 45Y22 (RR) 'Mystic' and 'Wahoo' were also highly resistant, with the least %LCI (
Original languageEnglish
Pages (from-to)69-76
Number of pages8
JournalCrop Protection
Volume86
DOIs
Publication statusPublished - 2016

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