Rust/Arisaema

In a message dated 01/12/2001 6:17:13 PM Central Standard Time, 
genebush@otherside.com writes:


 Gene And Nancy, Thank you for the response to my question about Rust and 
Arisaema. We also have a problem with it here in Minnesota. I stopped selling 
JACKS about four years ago because of the problem in our local woods.

It seems to be a naturally occurring cyclical thing.  Two and three years 
ago-when I would go out for a walk I would find many A. triphyliums. last 
year when I went for my yearly walk-almost all had rust.  This year the 
population is down substantially.

When a plant is infected-and one sees the "rust" spots-one needs to keep in 
mind that the whole plant is infected. 
It is a fungus that lives in the leaves and stems and corms.  The rust spots 
are just the "flowers" of the rust, and they release new spores that infect 
other plants.

Also most rusts are specific to the type of plant that they infect.


Oh boy. Let me think-about 15 years ago I had a number of A. triphyllium that 
came from a giant tetraploid race.  The plants grew over three feet high, had 
small hoods and cadux.  The stems were 2 inches in diameter with nice dark 
green leaves.  The corms one some of the were almost a pound each- I mean 
these were BIG.

They were an isolated population that I found while downing a research 
project and rescue of plants before a housing development went in.

After moving them-they lived for a few years and then got the rust and were 
done for in one season.  I still miss them.
 Our local population has some nice colors, with dark purple and stripes-but 
are only 1/4 the size.


again thank you for the information and the responses.

It was helpful for me to get an understand of how wide spread the problem is.

Paul

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