Abstract
Experiments were conducted to determine the value of growth regulator treatments in rootstock rootling and benchgraft production. The difficult-to-root varieties Dog Ridge and Ramsey, derived from Vitis champini, were used.
The five treatments and costs of the materials per 1,000 cuttings were as follows: 1) 24-hour soak in dilute Walter's Solution ($8A) (Australian dollars $1A = $1.10 U.S.), 2) 24-hour soak in dilute solution of I.B.A. ($3), 3) Five-second dip in concentrated solution of I.B.A. ($4), 4) Five-second dip in Seradix No. 2 dry powder ($8), and 5) Untreated control ($0).
The percentage of Dog Ridge benchgrafts showing root initiation after 21 days for each of the five treatments were 100, 100, 95, 40, and 2.5%, respectively. The rooting of Ramsey hardwood cuttings after 30 days for each of the five treatments were 76, 71, 73, 61 and 33%, respectively. I.B.A. treatment reduced the rooting time by 14 days for difficult-to-root cuttings and benchgrafts. Electricity savings of 25-30% could be achieved as well as a corresponding increase in output for a given propagation facility.
- Received February 1980.
- Revision received May 1980.
- Accepted May 1980.
- Published online January 1980
- Copyright 1980 by the American Society for Enology and Viticulture
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