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.
It may be interesting, as well as useful, to some of the Horticulturist readers to know of a safe and effectual method by which the fatal attacks of the peach borer may be prevented. Having tried all the plans proposed for the last five years - merely as an experiment upon neglected trees - I have found them all deficient in one thing, i. e., in preventing a renewal of attack. Nine years experience fully proves to me that the waste water of salt works, called "mother liquor," or "bitter water," is a sure preventive. I will not aver that it will kill the worm when once in the tree, as my experience is not conclusive on that point, but I do assert that it has killed them by thousands when partly in the tree and not entirely shielded by the bark.
We apply it any time during the summer, but when possible, in June and last of August, putting about one pint of the liquid around the base of each tree. At the same time we wash the body and main limbs of the tree with the same liquid, which removes scales of dead bark and kills the eggs of insects.
My observations in the treatment of trees to this liquor leads me to declare it to be the most powerful agent in preventing the dreaded disease known as "yellows" that has yet been discovered. Trees in a rapidly declining state from the effects of this disease, being treated to this liquor, took on a new life as it were, casting their yellow leaves and throwing out an immense healthy foliage. John M. Jenkins.