A single larva may make several mines.

Now for the hard questions: making mines safer or not at all.

Older larvae create another case in spring and feed on the upper surface of the leaves without making mines.

A single larva may make several mines during its lifetime.

Hans Luther made a living leasing and operating copper mines and smelters.

The larva makes several mines, and spends most of its time outside the mine, in a silken tunnel under the leaf.

After overwintering, the larvae make several new mines.

They feed on the upper surface of the leaves of their host plant, without making mines.

For example, he said, Iran can make naval mines, as its Government maintained recently.

Before hibernation the young larvae make tiny mines.