little round wooden “marbles” are often mistaken for the fruit
of the oak tree – which is of course the Acorn.
So where do they come from ? In the early Spring a little wasp lays her egg in the leaf
bud of the oak tree. This causes the oak to develop a “gall” to
protect the developing larva. Later in Summer the little worm like
larva burrows it’s way out of the Oak apple. Can you see the
little Exit hole on the surface of the oak apple ? Oak apples
contain high levels of Tannic acid and they were once collected and
used to manufacture ink.