@SamuelPatinha … your questions 1 and 3.
A few years back I grafted a scion of H63A American persimmon to one of my wild persimmon rootstock trees.
The rootstock was large and I did the whip/tounge graft at 40” high on the rootstock.
My scion had 2 buds and both grew well.
In my case… after about 16 inches of growth on each the growth from the top bud was looking dominant.. strong… so I chose it to be my central leader.. and I headed the growth from the lower bud back by about half the length.
The growth from the top bud grew well and made it to my desired height for scaffold branches. When it got to 54 inches I did a heading cut on the central leader… and maintained the lower support growth from that bottom bud.. keeping it short and simply in a support roll.
After I headed back the central leader… the buds below that heading cut then sent out a whirl of limbs.. that became the start of my scaffold branches and my new central leader.
At the end of the first growing season the top of it looked like above.
If you can get one to do that the first growing season.. ideal.
PS… in year 2 it ripened 7 fruit and ended up looking like below.
It is covered in blossoms and small fruit now here in year 3.
On your question 3.. on spraying new graft growth.
I have a pest here (Psyllids).. they are sap suckers and they love the new tender growth on grafts. If I dont notice them quickly and spray.. they can really wreck your new growth and cause the graft to fail.
Yesterday… I sprayed all 3 of my persimmon grafts with (Sevin) spray. The grafts are just starting to push new green growth… and I wanted to make sure the Psyllids are not launching an attack.
I have lost 3 or 4 persimmon grafts to Psyllid attacks over the last few years.
Psyllids as they attack that new growth.. they cause the leaves to curl up along the edge and get all disfigured.
That is a graft of Saijo that I did last spring and if you look at the lower leaves… see how messed up they are. Psyllid attack. I noticed the attack and sprayed them a couple times with (Sevin spray)… and wiped them out. After that the Saijo graft grew well the rest of the season.
TNHunter