Abstract
In September 2012, alyssum (Lobularia maritima) plants cultivated in a greenhouse in Nagano Prefecture, Japan were observed with yellowing of the adaxial surface of leaves and a white downy growth on the abaxial surface. We identified the causal pathogen as Hyaloperonospora lobulariae based on the morphology and rDNA-ITS sequences. Seedlings of alyssum were inoculated with the pathogen, and the original symptoms were reproduced. This is the first report of downy mildew of alyssum in Japan.
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