Thanks Nina;

Will Neem Oil do the trick ?

Mark Hill - Harrisburg PA - Zone 6

Neem oil is generally used as an insecticide, although people now use
it for everything (brush their teeth with it, too, I'll wager). It's
a protectant, not a systemic. If you have a slight infection, you
could use a protectant to, obviously, protect the healthy foliage.
I'd stay away from oils and copper sprays if you now have hot
weather- they can be phytotoxic, especially neem oil. You'd be best
off calling Cooperative Extension and asking them what to use for
black spot (I don't have the laws for Pennsylvania handy, sorry). In
New York, you'd be advised to use Maneb or Mancozeb.

If you have a LOT of black spot, it's too late for a protectant, and
you need a systemic, but I'm not sure there are any labeled for this.
To be honest, it simply isn't a serious disease. If you remove
disease leaves, clean the litter from under the tree and wait, the
whole thing will clear up. An otherwise healthy elm won't even blink
at black spot.

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