Like Mamuang, I had poor results grafting to older wood, but at the time I was using cleft grafts. Last year I used bark grafts and had some success.
I’m guessing that you meant 50% and not 0.5% (literally half a percent). Peaches are tricky- I’ve been grafting for 5 years and last year my take rate was 52% (26 of 50). That was measured in June- I think by the end of the season it was more like 23/50. Keep in mind that a lot of repetitions doesn’t necessarily indicate skill.
The early success rate(~70%) was much better than later though, so this year I’ll try to do more early grafts. This flies in the face of some other posters experience, who report doing better once there is some warmth. When I grafted all later in 2016, I came close to the 0.5% success, which is why I tried some earlier (2nd week of April) ones this year. Maybe if you get a few warm days early in the grafting season that would be the best of both worlds.
Very true- I was 46/47 on apples and pears…
The only one of these I am growing is White River. I’ve fruited it for a couple years and haven’t been impressed so far. There is lots of production, which I didn’t thin enough (maybe part of the problem), but the flavor wasn’t all that strong or sweet. I’m giving it another chance this year and will see if better thinning will do the trick. It is quite pretty with a lot of pink/red flesh.