"Nick Maclaren" wrote in message
...
In article ,
Pen Phill wrote:

How can I get rid of a couple of pufball fungi that are pushing up
tarmac on my
driveway? I have had them growing at the edge of the lawn before
and have just
dig them out. They are grey and quite hard at first but later if
one is mowed
off (not having noticed it) there is a cloud of brown spores. I
have pulled off
a lump of raised tarmac and the thing is there. Can I pour some
sort of killer
concoction onto it and if so what please?

No.

You might have reminded the OP that giant puffballs are edible.
Actually, sliced into steaks and fried in garlick butter they are
delicious.

The puffballs are merely the fruiting bodies of a mycelium that may
extend for a considerable distance. Anything that would kill that
would also pollute the ground water.

The root cause is, I am afraid, that your drive has been
inadequately
constructed. A thin layer of tarmac is notorious for breaking up,
whether by puffballs, shrub and tree roots, vehicles turning sharply
or anything else.

Franz