Identificaciones de john4
Fotos / Sonidos
Qué
Puccinia evadensObserv.
kuedaDescripción
This diameter of the coyote brush stem was about 3 cm. Observed on Mt. Diablo near Clayton, CA. Thanks to John Callender for the ID.
Identificación de john4:
Puccinia evadens,
Añadido el 03 febrero 2012
Apoyo a
Fotos / Sonidos
Qué
Puccinia evadensObserv.
barbarabDescripción
I noticed an abundance of swollen stems on Baccharis pilularis in the O'Neil Ranch area above Anna Jean Cummings Park. I've read the midge Rhopalomyia baccharis produces stem swellings on coyote brush, but I don't think they get as large as the ones I was seeing today. Rust is visible in the fissures in some of the large stem swellings. I've been wondering if there's and association between the rust and insect-induced stem galls. Also wondering if the rust is responsible for the dead and sickly Baccharis in the area.
Identificación de john4:
Puccinia evadens,
Añadido el 20 enero 2012
Mejorando
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