Help identifying fungus on guava

[jackedfruit]

I wish my first post on this forum would be of nicer character but what you gonna do... So, I'm a bit worried about a recent outbreak of some unknown fungi that seems to have started on my pear guava . It also seems it's spreading to some pomegranate seedlings and maybe (nothing serious yet but it might turn bad quickly if uncontrolled) even to the miracle fruits and the Surinam cherries.

If anyone could please help me identify the disease and maybe even recommend how to treat it I would be really grateful!