March
2010
, Volume
94
, Number
3
Pages
339
-
344
Authors
A. Suthaparan, Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, 1432 Ås, Norway;
Arne Stensvand, Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, and Norwegian Institute for Agricultural and Environmental Research, Høgskoleveien 7, 1432 Ås, Norway;
S. Torre, Department of Plant and Environmental Sciences, Norwegian University of Life Sciences;
Maria L. Herrero, Norwegian Institute for Agricultural and Environmental Research, Ås;
R. I. Pettersen, Department of Plant and Environmental Sciences, Norwegian University of Life Sciences;
David M. Gadoury, Department of Plant Pathology and Plant-Microbe Biology, Cornell University, New York State Agricultural Experiment Station, Geneva 14456; and
Hans Ragner Gislerød, Department of Plant and Environmental Sciences, Norwegian University of Life Sciences
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Accepted for publication 23 November 2009.
Abstract
ABSTRACT
The effect of day length on production and germinability of conidia and severity of disease caused by Podosphaera pannosa, the causal agent of rose powdery mildew, was studied. Whole potted plants or detached leaves of Rosa interspecific hybrid ‘Mistral’ were inoculated with P. pannosa and exposed to 0, 12, 18, 20, 22, or 24 h of artificial light per day in growth chambers equipped with mercury lamps. Increasing duration of illumination from 18 to 20 to 24 h per day reduced production of conidia by 22 to 62%. Exposure to 24 h of illumination per day also strongly reduced disease severity compared with 18 h. Our results suggest that increasing day lengths from 18 h per day to 20 to 24 h may suppress the disease significantly and, thereby, reduce the need for fungicide applications against powdery mildew.
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© 2010 The American Phytopathological Society
