Suggestion of rootstock for Chico

[dragon]

I have black and white sapote seedlings. Can I graft Chico to any of them? Please advise the method of grafting Chico because it have white sap when I cut through scion.

[Finca La Isla]

I don't think either of those root stocks could work.  Chico is not the easiest thing to graft.  I have only seen it on the same Chico root stock. 
Peter

[mangomike]

Sorry, but it will definitely not work. Chico is in the "sapote" family (Sapotaceae), while the "black sapote" is in the persimmon family (Ebenaceae) and the "white sapote" is in the citrus family (Rutaceae). Even though all three are called "sapotes" they are unrelated, and therefore not graft compatible.