sentences:  The economically important host of "Albugo occidentalis" is spinach ("Spinacia oleracea"); although the oomycete has also been reported to affect plants of the genus "Chenopodium", the genus including the crop plant quinoa.This pathogen causes white rust or white blister of spinach.It is unrelated to the basidiomycete rusts biologically, but appears somewhat similar on the surface of the leaf, sometimes causing the plant to form white or yellow blister-like pustules on leaves.