Jaboticaba45,
Splitting like that can be from Copper deficiency, resulting in inadequate strenthening of the bark, which then splits under sudden changes of hydration or temperature. Then infection can move into the open wound, and move into tissues having inadequate Copper, Zinc, Calcium, Silicon, Manganese, or Sulfur.
You could spray just that black cracked spot with 3% hydrogen peroxide, with its spray bottle from the drugstore, undiluted [not recommended for general spraying on plants, due to undeclared ingredients which are not labelled for use on plants]. [Good for sanitizing tools too.]
Spray trunk with any Copper Sulfate Pentahydrate fertilizer or fungicide, at the maximum recommended rate on the fungicide label, then add water to dilute, and spray the foliage. If you already have ammoniated copper, that should work too. Either one will penetrate quickly. Any other Copper molecules are likely to act mostly on the outside, and slowly penetrate some.