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.
This is the insect which disfigures so many of our apples, and causes such numbers of them to fall prematurely from the tree. Mr. Ewens, a member of our Society, in passing through his orchard, pulled up a sod of grass and laid it in the crotch of an apple tree; subsequently, he found it full of cocoons, which proved to belong to the insect in question. In this case, the apple worms, as is usual with them, had left the fruity after they had attained their full larval growth, (some of them while it was on the tree, and others after it had fallen,) to take refuge in the crevices of the trunk; but finding a convenient shelter in the tuft of grass, they availed themselves of it Dr. Harris has recommended old cloth to be used for this purpose; and it is evident that if these facto be taken advantage of when the infected apples begin to drop prematurely, the summer and autumnal broods may be materially diminished. It is of most importance to attend to the latter brood, which furnishes the individuals that live through the winter, and thus preserve the species for another year.