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Hi JonM, is that species myrciaria coronata or another thing?
Yes, it looks like some of my supposed sabaras or coronatas. Leaves are not red because is is not so much cold in your area!
hi!Probably excess phosphorus in the substrate, but do not worry, do not kill the plant, you can leave the seedling in the shade to acclimate better, leaving only a few hours of sun a day.Yesterday I did fertilization with phosphorus in my jabuticabas and some may soon have leaves as well.Another rarer cause here is mite attack, but it also does not cause much damage to the plant.Good farming!