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Grafting fraser fir (Abies fraseri (Pursh) Poir.) scions onto rootstocks of turkish fir (Abies bornmuellerianaMattf.) is a strategy used by some Christmas tree growers in the southern Appalachian Mountains ofNorth Carolinatoreduce losses byphytophthora root rot caused byPhytophthoracinnamomiRands.Thisstudycomparedthe traditional timeof grafting (April) with eight summer/early fall grafting dates from mid-July through mid- October.Shadeandirrigationtreatmentswerealsosuperimposedonthegraftingdates.To ensure optimal grafting success, grafting should be performed in the late winter/early spring(April)whenscionsaredormantandtherootstocksarebecomingactive.Aprilgraft success was 95% but when grafting fresh scions in summer/fall, graft success decreased from 52% in July to 0% in October. Shade improved summer graft success (52% with, 38% without). Irrigation did not significantly affect graft success or subsequent growth. In a supplemental storage study, grafting of stored scion material in summer/early fall was not successful (less than 1%).

Grafting Fraser Fir (Abies fraseri): Effect of Grafting Date, Shade, and Irrigation