Rhizoctonia commonly causes a stem base canker on mums. During the summer
of 2002, it was also found causing a foliar blight. The leaves looked
as if injured by overfertilization or a phytotoxic spray. Garden mums
should be grown with as little contact with field soil as possible,
to eliminate the source of the common soil fungus Rhizoctonia. Many
of the usual Rhizoctonia fungicides, as well as chlorothalonil-containing
products, are registered for us against foliar blights.