This section is from the book "The Gardener's Monthly And Horticulturist V18", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
This is a very simple matter. A piece of paper tied around the stem near the ground, and tarred, is sufficient. Pine tar should be employed, gas tar often contains creosote in sufficient quantity to penetrate the paper and injure the bark.