Arisaema

[Addison & Richardson]

Jean,
Pascal P. Pirone in his "Diseases & Pests of Ornamental Plants (5th
ed.) writes:
"The roots are apparently not invaded by the fungus.  It is believed
that the germinating spores of the fungus may infect young shoots but cannot
reach the corms, which are deeply imbedded in the ground. ... The mycelium
of the fungus invades all parts of the plants, even the young ovary and
ovules.  The disease is evidently spread by the seed, which carries the
mycelium.
"Control: Since this is a systemic disease spraying with sulfur
fungicide does not prevent the extension of the disease in plant already
infected, but might prevent it's spread to healthy plants.  Diseased plants
should be pulled up and destroyed."
Lois Anne Addison
bedrock.gardeners at sympatico.ca
Dunrobin, Ontario (35 miles west of Ottawa),CANADA
Cdn. Z5; USDA Z4 (lowest temp -40C; highest 37C)