The tent caterpillar, which is easily seen, should be destroyed at once.
I need only mention the canker worm and American tent caterpillar, and the various kinds of cut worms, as instances.
It is not to be expected that the San Jos Scale can be exterminated any more than the tent caterpillar or apple scab can.
Many children took the tent caterpillar, reared it from the eggs, and learned all about its metamorphoses.
About ten years ago a few nests of the tent caterpillar were cut off and burned.