John Savage wrote in message news:030720000111252.20Jul03$rookswood@suburbian. com...
(simy1) writes:
Also of note is the fact that earthworms propagate very slowly, no
more than 20-30 feet per year if they have to do it themselves. There
are large tracts of not previously farmed land where they have not
appeared yet.

Wouldn't the earthworm eggs get widely distributed by rainwater runoff
and soil carried on vehicles and the roots of transported seedlings and
on the muddy hooves of native, feral, and introduced animals?

I do not know - good question though. It is a fact that there are
places in this country and Canada which are earthworm-free.