Is this a fungus on my peach tree?

Can anybody let me know what this is and how to treat it? Thank you!

The leaf damage is peach leaf curl and usually happens if the leaves get damp at the wrong time.  Locally we grow the peach under the eves of the house so that it never gets rained on and are careful not to water the leaves.

The trunk looks to be within normal range with a lot of sap leaking from the cut.  It was probably cut during the growing season or when the sap was running.  (think maple syrup).  It should seal itself if you just leave it.  To prevent this in the future try not to make such a big cut if you can avoid it or use a wax sealant to help protect the wound.  

There might be something else in the black part of the bark, but it's difficult to see and depends a lot on your location and what kind of space the tree is growing in.  

The red leaves are peach leaf blister and are symptoms of the peach leaf blister fungus caused by windblown spores from infected leaves from last year, and it overwinters releasing spores in the spring. I have it too on my peach trees in the spring. It looks alarming and unsightly and in my experience it is temporary and new leaves will emerge as spring continues that will not be affected. There is a short window when it occurs in the damp rainy spring. To minimize the occurrence of it next season, rake, remove and burn the leaves that drop from the trees in the fall if practical.

My understanding is that Peach leaf curl can happen when leaves get wet. A fungal disease. that can lead to defoliation and stop fruit growth. The usual removal and disposal of all diseased leaves, being careful to dispose of ones that have fallen on the ground is important. I have had good results in knocking it back with an anti-fungal essential oil spray. The recipe varies a bit, but Essential oil of Oregano, Thyme, Cloves and Tea Tree can also be helpful. Adding Neem oil wouldn't hurt. I just put about 30 drops (some of each) in a litre spray bottle, shake it up and spray on the remaining leaves, stem and the soil.  Like I said, I have had good results with this, but I am still having some return of it each spring. I just try to treat it asap.  There is probably cheaper methods than essential oils, and maybe Neem would be sufficient on it's own.

Can i spray organic fungicide with peaches on the tree?