10 - 20 days after grafting
||Melnyk CW. Plant grafting: insights into tissue regeneration. Regeneration (Oxf). 2016 Dec 21 4(1):3-14. doi: 10.1002/reg2.71 p.10 left column bottom paragraphPubMed ID28316790
||Espen L., Cocucci M., & Sacchi G. A. (2005). Differentiation and functional connection of vascular elements in compatible and incompatible pear/quince internode micrografts. Tree Physiology, 25(11), 1419–1425.PubMed ID16105809
||Primary source abstract: "Micrografts of internodes excised from in vitro grown pear plants (Pyrus communis L. cv. 'Bosc' (B) and cv. 'Butirra Hardy' (BH)) and quince (Cydonia oblonga Mill. East Malling clone C (EMC)), were cultured aseptically to test the effectiveness of their functional vascular reconnection in relation to incompatibility-compatibility relationships that these genotypes exhibit in the field."
||P.10 left column bottom paragraph: "In horticulture, quince is often
used as a rootstock for pear scions, and compatible cultivars show
phloem connectivity within 10−20 days after grafting (primary source). Certain incompatible combinations show limited
phloem connectivity even 30 days after grafting and xylem differentiation
is delayed (Espen et al., 2005). This type of incompatibility is
presumably quite common between unrelated species and is straightforward
to identify due to poor growth or death."