Girdling, as practiced in commercial vineyards, consists of the removal of a ring of bark from 3 to 6 mm wide entirely around a selected trunk, cordon, or cane of the vine to: (1) hasten maturity; (2) aid uniform berry coloring; (3) increase the size of berries and clusters; and (4) improve berry set or increase the number of berries in a cluster. Previously, only seedless varieties were subject to or recommended for girdling elsewhere in the world.
The solution offers application of the girdling technique for seeded grape varieties which distinguishes it from previous efforts. The solution was tested and implemented by the DAI Global, LLC in Uzbekistan while promoting girdling in Uzbekistan since 2013.
When girdled the energy flow generated in leaves is temporarily redirected toward clusters and berries resulting in earlier ripening time, increased berry and bunch size, and better coloring. Grapevine girdling only requires a 3 to 6 mm girdling knife. Girdling knives have two blades spaced 3-6 mm and cost between $15-30. Grapevines can also be girdled using a regular knife through two separate cuts but require greater mastery of the technique.
The experiment held from 2013-16 confirmed girdling’s impact on early ripening seeded table grape varieties. Berries increased in size by 10 to 30 percent, ripened 15 to 30 days earlier, and exhibited better uniform coloration in the local seeded varieties (red Vitis Vinifera Rizamat and Vitis Vinifera Andijon Qora). The optimal time to apply girdling is the period post- bloom until the start of berry coloring. It is recommended to apply this technique on mature producing grapevines (at least 4 to 5 years old).
In Uzbekistan, girdling enabled early ripening which contributed to higher incomes through early sales of the girdled grapes obtaining prices between 50 to 100% higher than the regular ripening period. In addition, berry coloring was more uniform on girdled vines. Girdling of seedless and seeded grapes enables early and extended supply of highly demanded varieties of grapes for both local and export markets.
Partners: “Dolanalik Bogbon Mevasi” farm enterprise in Andijan Province; “Azizbek AXA” in Fergana Province; the Andijan Agricultural Institute; USAID’s program in Uzbekistan.
Representative Office of Development Alternatives Inc. in Uzbekistan,
Address: 104A Kichik Beshagach Street, Tashkent
Contact person: Gholibjon Mahmudov
Telephone: +998 87 701 7502