This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
After several years' trial, I am confident that the application of fine brimstone (flour of sulphur) to the base of the tree will preserve it, first moving away the earth about three inches deep, and destroying the worms, if there be any, applying a small or large handful, according to the size of the tree, and replacing the earth.
This may be done every year, for a certainty, or once in two years. This I accidentally discovered, moving the earth from a peach tree 6 or 8 inches in diameter, much injured by the worms, the bark all off, and the wood badly eaten away. Having a jar of flour of sulphur by me, I emptied the contents, from half a pound to a pound, in the opening made around the tree, to clean out the worms. The earth was replaced, with slim hopes of the tree recovering; but during the summer the foliage assumed a deep rich green, and the tree grew finely.
On removing the earth in the following spring, no trace of the wound was visible. Since then, the use of sulphur has kept my trees free from borers, and I have no doubt but a mixture of sulphur and soft soap applied to the base of apple trees with a brush, would prevent the depredations of the apple tree borer.
 
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