Robuta

https://conservancy.umn.edu/items/253c861c-488f-4fd3-9105-5291b4ffabdd A Study of the Factors Affecting the Callusing and Rooting of Hardwood Apple Cuttings a study of the https://lists.ibiblio.org/sympa/arc/nafex/2007-12/msg00337.html nafex - Re: [NAFEX] Excessive callusing - arc nafex excessive arc