[gardeners] A "What is it?" Question

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Dear Gardeners,

Last evening I noted something on the leaf growth on Ipomoea, Sweet Potato
Vine 'Blackie.'  The plants are in our polyhouse.  Whatever this "stuff
is, neither my GP nor I have ever seen it before.   A picture would help
but, since I don't have that to send, I'll do my best to describe it... and
I'm hoping someone out there may have an answer.

The gross appearance was of whitish projections on only the upper leaf
surface, something like witchhazel gall.  They were firm to the finger
touch and about 1 to 2 mm high.  We looked at them under a dissecting scope
and found them firmly attached to the surface.  When broken from the
surface with a forcep, liquid was released but any larvae or spores were
not obvious.  The structure was neat, like iced stalactites or stalagmites,
with smooth points and some surface bumps.

Lordy, lordy, I hope it's not some major pathogen!  We isolated two
affected plants.  Can anyone help us ID this "stuff"?  Thanks much!

Linda in NW Ohio near Toledo/Lake Erie, USDA Zone 5
llbs@mail.glasscity.net

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