Please help my (what i think is) Pomegranate tree

[Domesticated Lynx]

Hallo everyone
I moved to California from the land of never ending rain and I am not familiar with flora of this climate. In addition no experience in gardening. Year ago we moved to the apartment with the small patio. There were few plants and some bush which I lovingly watered. Couple of weeks back I noticed a flower bud on the said bush that looked like it belongs to Pomegranate tree. Unfortunately two days later i noticed black spot on it and then it dropped. In addition i noticed some changes (see attached photos). I searched google for an answer but I can find what is bothering the tree. I cant see any insect except few lacewing eggs and no ants. Leaves and twigs were red leaves are have sticky clear sap present but again I cant see any insect. Any advice will be greatly appreciated.

 

[Marck]

Greetings, welcome to the Forums.

Overall, the foliage on your Pomegranate (Punica granatum) looks healthy. There is some damage from chewing insects but it is not severe. Of more concern is why it has developed only one known flower and no fruit by mid-Summer.
How many hours of sun does this shrub receive each day?

Pomegranate (Punica granatum), in the Loosestrife family (Lythraceae), originally native to Anatolia and southwestern Asia, but grown widely since ancient times for the juice-filled seed arils within its fruit.