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Research Article
Impact of tricyclazole and azoxystrobin on growth, sporulation and secondary infection of the rice blast fungus, Magnaporthe oryzae
Article first published online: 30 AUG 2012
DOI: 10.1002/ps.3386
Copyright © 2012 Society of Chemical Industry
Additional Information
How to Cite
Kunova, A., Pizzatti, C. and Cortesi, P. (2013), Impact of tricyclazole and azoxystrobin on growth, sporulation and secondary infection of the rice blast fungus, Magnaporthe oryzae. Pest. Manag. Sci., 69: 278–284. doi: 10.1002/ps.3386
Publication History
- Issue published online: 23 JAN 2013
- Article first published online: 30 AUG 2012
- Accepted manuscript online: 10 JUL 2012 08:38AM EST
- Manuscript Accepted: 10 JUL 2012
- Manuscript Revised: 26 JUN 2012
- Manuscript Received: 11 APR 2012
- Abstract
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- Cited By
Keywords:
- fungicide;
- effective dose;
- infection efficiency;
- Oryza sativa
Abstract
BACKGROUND: Rice blast, caused by Magnaporthe oryzae B. Couch sp. nov., is one of the most destructive rice diseases worldwide, causing substantial yield losses every year. In Italy, its management is based mainly on the use of two fungicides, azoxystrobin and tricyclazole, that restrain the disease progress. The aim of this study was to investigate and compare the inhibitory effects of the two fungicides on the growth, sporulation and secondary infection of M. oryzae.
RESULTS: Magnaporthe oryzae mycelium growth was inhibited at low concentrations of azoxystrobin and relatively high concentrations of tricyclazole, while sporulation was more sensitive to both fungicides and was affected at similarly low doses. Furthermore, infection efficiency of conidia obtained from mycelia exposed to tricyclazole was affected to a higher extent than for conidia produced on azoxystrobin-amended media, even though germination of such conidia was reduced after azoxystrobin treatment.
CONCLUSIONS: This study presents for the first time detailed azoxystrobin and tricyclazole growth–response curves for M. oryzae mycelium growth and sporulation. Furthermore, high efficacy of tricyclazole towards inhibition of sporulation and secondary infection indicates an additional possible mode of action of this fungicide that is different from inhibition of melanin biosynthesis. Copyright © 2012 Society of Chemical Industry