SOME OBSERVATIONS ON GRAFT INCOMPATIBILITY IN DOUGLAS-FIR (PSEUDOTSUGA MENZIESII MIRB. FRANCO) (*)

ISHS Acta Horticulturae 227: International Symposium on Vegetative Propagation of Woody Species

**SOME OBSERVATIONS ON GRAFT INCOMPATIBILITY IN DOUGLAS-FIR (PSEUDOTSUGA MENZIESII MIRB. FRANCO) (*)**

Authors:

R. Giannini, M. Lambardi, G.G. Vendramin

Abstract:
Graft incompatibility is a serious problem facing Douglas-fir orchardists. Some grafts die during the first and second year after grafting (early incompatibility), but large losses occur even after many years (delayed incompatibility).

Clones with delayed incompatibility develop an initial scion overgrowth symptom and, eventually, many of such overgrown grafts die. Anatomically, delayed incompatibility involves the initiation and penetration of suberin zones and the development of abnormal woody tissues ("wound-xylem areas") in each union area where the stock and scion cambiums join. For several years there is a natural regrafting of stock and scion tissues, but in time, the regraft fails and the graft dies (Copes, 1969, 1970).

The objectives of this research are:

to study the influence of grafting time and of three rootstocks of different geographic provenance on early and delayed incompatibility;
to verify the degree of incompatibility of seven clones from a plantation at Vallombrosa (Florence).

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