1. UC IPM
California fan palm, <i>Washingtonia filifera</i>, with petiole blight, caused by <i>Serenomyces</i> spp. An infected petiole typically has a reddish brown streak running its length.
California fan palm, Washingtonia filifera, with petiole blight, caused by Serenomyces spp. An infected petiole typically has a reddish brown streak running its length.
Credit: Donald R. Hodel, UCCE Los Angeles County