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Probably the most prominent citizen of the apple-tree is the codlin-moth. Its larva is the apple-worm, the one that makes "wormy apples," the burrows going to the core and out again. The insect is native in Europe, but has been known in North America nearly two hundred years, and is widespread in the apple countries of the world.
In the fall they can be spread, and they at least make one of the best of fertilizers. The codling-moth, or apple-worm, is another enemy that should be fought resolutely, for it destroys millions of bushels of fruit. In the latitude of New York State this moth begins its depredations about the middle of June.
Ordinarily the fruit-grower does not see the moth, for it is a small object amidst the foliage of apple-trees; the larva or apple-worm he knows well. There may be two or more broods of apple-worms, depending on the length of the season. In the northern apple regions of North America there is usually only one brood, with a partial second brood.
By some instinct, it is able to cognize a dying apple. The later worms, either the lastlings from the early brood or the product of subsequent broods, may remain in the apple when it is harvested, particularly in an apple picked before it is quite mature and from which the worm has not escaped. The apple-worm ruins the crop by killing many of the fruits and by blemishing the remainder.
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