Let us know where you live and your zone first. Different climates present different challenges both for diseases and pests,

A multi grafted fruit tree adds one more challenge to it; that is to make sure pruning is done right so no one variety would dominate or get squeezed out.

I have the same tree, though I don't use an organic approach. My biggest problem with all of my multi grafts are the fast growing varieties that want to take over, basically what rphcfb14 is referring to. Here, it's the Blenheim apricot that far and away outgrows the other varieties.

For the bugs, tanglefoot can organically control the ants and natural predators will take care of the rest without the ants to guard them. If you still have insect issues even with tanglefoot, neem oil is an organic product that is supposed to work.

I live in zone 8a - Charlotte, NC. I have been reading up on pruning multi-grafted tress and how to prune the most aggressive fruit so that it stays in it's own space and does not overtake the other fruits. My aggressor is the nectarine, followed by the plum. 3rd is the apricot and last, the peach. The nectarine has 4-5 of the longest, thickest branches. The plum has three thick, long branches. The apricot has 3 branches, but two of them are very short and thin. The peach has two thin branches, not very long. I removed an entire branch from the nectarine and pruned it and the plum back so that they are now just a bit longer than the apricot and peach branches. I pruned the apricot and the peach just a bit. I will try the tanglefoot for the ants and I see that they several products. I already have neem oil too. fireball, do you get fruit from all 4 fruits? What about your other multi-grafts? Do you get fruit? I think multi-grafted trees are very interesting. I hope I have success with this baby.

As of right now, I have 5 different varieties on that tree. It's a 5 in 1, each variety being single except for the peach, of which there are 2 varieties on the tree. This is the third year in the ground and each graft has at least one fruit on it. The apricot and santa rosa plum have about 5 and 10 fruit respectively, after thinning. I also have a multi graft pluot 3 in 1, with 2 of those varieties being absolutely loaded with fruit even after thinning twice. I purchased a 4 in 1 apricot/aprium for my Mom and it formed up perfectly, with each graft growing about the same. Lots of fruit on it now. For my dad, I purchased a peach/nectarine 4 in 1. This one we had trouble with because I wasn't around to prune. We planted with the thinnest graft facing southwest, but the next thinnest faced the back and it is being shaded out by other grafts on each side. Those grafts have grown so aggressively that they have almost overtaken the 2 smaller grafts. I haven't been up to check in about a year so I don't know how it's doing over all.

Wow firebalsocal, you have a lot of trees! It sounds like they are all doing well. I am jealous. You have that beautiful Southern CA weather! I really want a pluot! Maybe next year. Where do you buy them? I should never have mentioned insects and diseases. I think I jinxed myself! I just took a look at my little tree, and the leaves on the plum branch are now covered with brown spots. Some of the new, smaller leaves are yellow and falling off! Photo attached. It just happened today. The other branches are fine! The Only thing I did was to spray the tree with Garden Safe Garden Insect Killer for the ants. Any thoughts on what it is and what I should do? I am going to make a separate post too. I hope I don't lose the plum!

You might want to pull a few leaves, seal them in a ziplock baggie, and see if your local nursery can give you ideas. My only thought is when you applied the spray, the drops acted like little magnifying glasses and burned the leaves. I'm not familiar with the disease issues you might have out there so the nursery is your best bet.

That is a great idea! I will take some leaves to a nursery in a ziplock. I was spraying for ants-but I will say because it was early evening plus the products is organic. Live and learn-and I have a lot to learn. Once I get this one down, I would love to grow others. do you get your trees from Dave Wilson?

Most of them, yes. I found one of their fruitwise videos on youtube and went from not wanting anything to take care of outside to 27 fruit trees in the ground in 7 years time. I've been following their backyard orchard culture ideals with mostly success, and a few lessons learned.