Tim Tyler wrote:
Someone on:

http://www.lawnsite.com/showthread.php?t=43364

...recommends drilling holes into the stump - to allow
herbicides to penetrate.

They also state:

``A mulberry seed has a coating on it that will not
allow the seed to germinate. This coating is removed
only by passage through a bird's gullet. And consequently,
you find mulberries growing where birds tend to sit,
under eaves of house, fence lines, under other trees
and shrubs, and under power lines.''

I germinate black mulberries without such processing.

However:

Does Ingestion by Birds Affect Seed Germination?
A. Barnea, Y. Yom-Tov, J. Friedman

....and...

The impact of frugivorous birds on seed dispersal and germination of
multi-seeded berries: Mullberry (morus nigra) and Nightshade (Solanum
luteum). The 25th meeting of the Zoological Society in Israel. 1988.
Barnea, A., Yom-Tov, Y. and Friedman, J.

....seem to concur: a bird's gut helps.
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