Thanks again Jim;

I just wandered about my property and noticed that my LARGE crab apple tree
appears to be suffering from the same "yellow leaf/black spot" symptoms.
From what I recall, this tree displays this "feature" every year. A neighbor
next door(500 feet away) has a similar crab apple with similar features.
This is the first time I've seen my Elm produce these yellow leaves with
black spots.
Any chance that a leaf from the apple fell into the Elm pot and caused this
disease ?

Nope. The apples probably have cedar-apple rust (see archives, or
the summer issue of ABS magazine), the symptoms of which I'm
beginning to see on apples here. Plant diseases are fairly specific;
generally they remain within a given plant family, although there are
plenty of exceptions.

Jim is being very hard on fungicides, but basically he is correct (if
it's sold to the general public, that usually means it doesn't work).
I never use fungicides on my bonsai. However, there's a difference
between what's the best thing for people with just a few plants to
do, and what's right for a nursery owner. Nursery owners *have* to
spray for some things. Whereas you can just as easily pull off
diseased leaves.

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