GK-01 1/8" Girdling Knife 1/8" Cut Blade Design. Forged, Stainless construction with a wood handle. Girdling (removal of a strip of bark tissue) is a practice that has been used on fruit plants for centuries. California as well as the countries of Israel and South Africa utilize girdling as a regular part of their cultural program on peaches and nectarines. Following years of experience, growers in California have ably mastered the art of girdling to accomplish two primary goals, namely to increase fruit size and earliness of harvest. Girdling Knifes are used to make a cut in the cambium layer of grape vines and some tree fruit to stimulate fruit production over leaf production.