What's biting into my soursop branches? They turn into black gashes.

[JoshuaTilaranCR]

Can someone identify what might be biting my soursop branches? When the branch is green I find little black spots on them and as they grow the spot opens to a gash. I imagine something is biting it and sucking out the sap but I've never seen anything on there that might be the culprit. The only thing I've seen that could be but I never find a bite when I take them off is a thick white scale with a red or orange dot on the inside. I haven't seen that scale on any other tree in my yard and it's like a big shield shell. I'll try to find one and post a picture of it. I spray the tree once a month with a soap and oil mix that kills any aphids but doesn't work so well on scale.

[Finca La Isla]

I would expect that the black stingless bee known locally as ‘conga’ could be the culprit.
Peter

[JoshuaTilaranCR]

Really?!? Oh well, I guess I'll just leave it then. Those bees (I think) and others are all around here feeding on the banana flowers. This is the second guanabana we've had here. The first we took down because it was infested with fungus and passed a lot of it to the orchid collection. This one is planted further away but with those open wounds I'd imagine the mold will soon start to colonize.

[Finca La Isla]

Congas are a serious problem for guanabana, citrus, etc.  Spread wet calcium carbonate on the wounds and see how it goes.
Saludos

[JoshuaTilaranCR]

I didn't realize that! Thanks for the recommendation, I'll pick some up in the next couple days!