Looking for some opinions on the ID of this Cherimoya please. The fruit itself is large and inedible. Seeds make excellent rootstock. I'm thinking a seedling of El bumpo maybe? just a guess, the tree itself is very old, maybe 40 to 50 yo, the house where it's planted was build in the 50's so could be older.
Lastly, the tree is a prolific self pollinator, with fruit on the tree all year. It's a big pity it's inedible, ie the fruit goes bad before it ripens, tried many fruits at many stages of ripeness.
The tree is located in Australia north of Sydney.
This fruit was picked green and early, today, still had more growing to do.