Effects of wetness period and temperature on development of dark pod spot (Alternaria brassicae ) on oilseed rape (Brassica napus )

A - Papers appearing in refereed journals

Hong, C. X., Fitt, B. D. L. and Welham, S. J. 1996. Effects of wetness period and temperature on development of dark pod spot (Alternaria brassicae ) on oilseed rape (Brassica napus ). Plant Pathology. 45 (6), pp. 1077-1089.

AuthorsHong, C. X., Fitt, B. D. L. and Welham, S. J.
Abstract

In controlled environment experiments, when oilseed rape pods or leaves were inoculated with spore suspensions of Alternaria brassicae, the maximum disease incidence (proportion of pods or leaves diseased) increased as wetness period after inoculation increased from 4 to 24h and as temperature increased to 20 degrees C. There was a clear relationship between disease incidence on pods and incidence on leaves with the same wetness/temperature conditions. Logistic equations described the effects of wetness period after inoculation on disease incidence (number of pods or leaves infected) or disease severity (number of lesions on pods or leaves) using temperature-dependent and tissue-dependent parameters. The time from inoculation to the appearance of the first lesions was shorter on pods than on leaves at temperatures less than or equal to 15 degrees C and wetness periods less than or equal to 12 h. Two-dimensional response surface equations or simple interpolations from one-dimensional equations were used to develop contour maps of expected disease incidence and severity, respectively, on leaves or pods to estimate the effects of different combinations of wetness period during infection and temperature on disease development.

KeywordsAgronomy; Plant Sciences
Year of Publication1996
JournalPlant Pathology
Journal citation45 (6), pp. 1077-1089
Digital Object Identifier (DOI)doi:10.1046/j.1365-3059.1996.d01-193.x
Open accessPublished as non-open access
Funder project or code101
206
204
424
ISSN00320862
PublisherWiley

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