Effects of temperature and rainfall on date of release of ascospores of Leptosphaeria maculans (phoma stem canker) from winter oilseed rape (Brassica napus) debris in the UK

A - Papers appearing in refereed journals

Huang, Y-J., Liu, Z., West, J. S., Todd, A. D., Hall, A. M. and Fitt, B. D. L. 2007. Effects of temperature and rainfall on date of release of ascospores of Leptosphaeria maculans (phoma stem canker) from winter oilseed rape (Brassica napus) debris in the UK. Annals of Applied Biology. 151 (1), pp. 99-111.

AuthorsHuang, Y-J., Liu, Z., West, J. S., Todd, A. D., Hall, A. M. and Fitt, B. D. L.
Abstract

Data from a controlled environment experiment investigating effects of temperature on maturation of Leptosphaeria maculans pseudothecia were used to derive equations describing the times until 30% or 50% of pseudothecia were mature as a function of temperature. A wetness sensor was developed to estimate the oilseed rape debris wetness and operated with debris exposed in natural conditions in 2000 and 2001. The maturation of L. maculans pseudothecia on debris and concentrations of airborne L. maculans ascospores were observed from 1999 to 2004. There were considerable differences between years, with the first mature pseudothecia observed in September in most years. There were linear relationships between the first date when 10% of maximum ascospore release was observed and the dates when 30% or 50% of pseudothecia were mature. By summing the daily temperature-dependent rate of pseudothecial maturation for days after I August with rainfall > 0.5 mm, the dates when 30% or 50% of pseudothecia were mature were predicted. There was good agreement between predicted and observed dates when 30% or 50% of pseudothecia were mature. These equations for predicting the timing of L. maculans ascospore release could be incorporated into schemes for forecasting, in autumn, the severity of phoma stem canker epidermics in the following spring/summer in the UK.

KeywordsAgriculture, Multidisciplinary
Year of Publication2007
JournalAnnals of Applied Biology
Journal citation151 (1), pp. 99-111
Digital Object Identifier (DOI)doi:10.1111/j.1744-7348.2007.00157.x
Open accessPublished as non-open access
Funder project or codeCentre for Sustainable Pest and Disease Management (PDM)
Centre for Mathematical and Computational Biology (MCB)
ISSN00034746
PublisherWiley

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