Plants > Plant Pest Information > Watermark Disease of Willow  

Watermark Disease of Willow* - Brenneria salicis (Day)

All willow (Salix) species are more or less susceptible.

Brenneria salicis is a vascular pathogen that spreads within the xylem of infected trees. The bacteria invade the wood of diseased trees, overwintering within the tree and invading new annual rings each year, often by way of feeding tunnels left by insects.

*=Erwinia salicis