How big are the damaged mangoes in that picture? When you cut a damaged mango open, is there any evidence of insects in the damaged areas?
The mangoes in picture are around 2-3 inches long.
I haven't been able to cut one open today, i hope maybe tomorrow. There wasn't any sign of insect presence in the one i did cut but the damage could have indeed been insect damage; i noticed some kind of spongy black tissue, like there were some galleries, but no larvae inside. Not that this excluded anything; also the fungus as previously mentioned could be the result of insect activities, because some insect have fungus hosts.
32 Celcius is common temps in Florida and other mango growing regions. I have trouble believing that is the issue (doesn't really look like burn damage). If the sun's heat were the culprit, I would also expect there to be leaf burn damage.
I agree with you; 32C isn't enough to damage a mango in normal cases. What doesn't make turn completely my nose to the idea is the fact that we come from a REALLY cold and wet spring with no warm episodes whatsoever (20C max temp, 12-15°C temps min), and i removed the cover of my mango (wich works also as UV screen) just at the beginning of the warm spell (4 days ago). But i agree with you i probably should see at least some degree of leaf burn if the heat was such an issue. There may be the case when the fruit that (make sense) have a worse heat dispersal mechanism than leaves, may be damaged while the leaves say just fine?
As for now i attempted a spray with methyl thiophanate, it's a wide spectrum fungicide, systemic, should at least give some kind of protection. I'm avoiding copper for now because i'm worried about the fact that in high heat it could result as phytotoxic.
Will try with confidor if i don't get any changing from todays spray.
Too bad i hurt badly my knee in last days and i can't give the plant alla the care i'd like.