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California fan palm, <i>Washingtonia filifera</i>, with petiole blight, caused by <i>Serenomyces</i> spp., has a reduced canopy of leaves. — California fan palm, Washingtonia filifera, with petiole blight, caused by Serenomyces spp., has a reduced canopy of leaves.
Credit: Donald R. Hodel, UCCE Los Angeles County