Arisaema Rust

[Paul Botting]

Addison & Richardson:

I've had rust on A. heterophyllum and one or two other species or crosses.
I sprayed with a combination of Benlate and Cygon and it seemed to arrest
the infection at whatever stage it was at.  It did not seem to be
particularly fast spreading.  The plants were fine the next year.  While it
is disturbing on a $20 plant, I don't think it will prove a big problem.

Paul Botting
Gaithersburg, MD