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Effects of conidial concentration and stigma wetness period on infection by the sorghum ergot pathogen Claviceps africana
S. A.
Bhuiyan A E,
M. J.
Ryley C,
V. J.
Galea B,
D.
Tay D,
A. T.
Lisle B
A
BSES Limited, Private Bag 4, Bundaberg DC, Qld 4670, Australia.
B
School of Agronomy and Horticulture, The University of Queensland, Gatton, Qld 4345, Australia.
C
Queensland Department of Primary Industries and Fisheries, PO Box 102, Toowoomba, Qld 4350, Australia.
D
Ornamental Plant Germplasm Centre, The Ohio State University, Columbus, OH 43210, USA.
E
Corresponding author. Email: sbhuiyan@bses.org.au
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Australasian Plant Pathology 38(5) 496–499 http://dx.doi.org/10.1071/AP09032
Submitted: 2 April 2008
Accepted: 16 May 2009
Published online: 17 August 2009
Abstract
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 106 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.
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Australasian Plant Disease Notes
