Effects of conidial concentration and stigma wetness period on infection by the sorghum ergot pathogen Claviceps africana

The effect of conidial concentration and length of stigma wetness period on infection of sorghum spikelets by Claviceps africana was studied in a controlled environment experiment. A spore concentration of at least 10 6 conidia/mL was required for maximum infection on sorghum panicles. Maximum infec...

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Bibliographic Details
Published in:Australasian plant pathology 2009-01, Vol.38 (5), p.496-499
Main Authors: Bhuiyan, S.A, Ryley, M.J, Galea, V.J, Tay, D, Lisle, A.T
Format: Article
Language:English
Subjects:
Agriculture
Biomedical and Life Sciences
Claviceps africana
Conidia
Ecology
Entomology
Epidemiology
Ergot
Infection
Inoculation
Life Sciences
Pathogens
Plant Pathology
Plant Sciences
Sorghum
Stigma
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Summary:The effect of conidial concentration and length of stigma wetness period on infection of sorghum spikelets by Claviceps africana was studied in a controlled environment experiment. A spore concentration of at least 10 6 conidia/mL was required for maximum infection on sorghum panicles. Maximum infection occurred during a stigma wetness period between 4.5 and 6 h. Approximately 11–15% infection occurred when stigmas had been dried immediately after inoculation. This study demonstrated that the stigma wetness is an important parameter in sorghum ergot epidemiology.
ISSN:0815-3191
1448-6032
DOI:10.1071/AP09032