It might be scale but your picture is so out of focus it is impossible to tell for sure.
NO! I said I didn't think it was scale. I thought I would do some research and find out what it really was and all I could find was the fertilizer issue but I did come across other folks who have had the same thing. They all had one thing in common and that commonality being that the plant had been moved from outside to inside. All of the little trees exuded a clearish type sticky sap on the trunk and some stems of the seedling tree.From what I've read about the jacarandas, they don't need much fertilizer. So I do it once every few months. I found this other thread that seems to have the same issue, and Chuck seemed to think it was a hard scale insect. I may try a neem oil solution and see if it helps.
I just don't know. It would be a big help if we had the history of the plant. As far as roots are concerned, if it were my plant that would be the first place I would look. However, this seems to be more of a guttation or transpiration issue. Sort of like overwatering and the added water from the roots caused a pressure increase and liquid was exuded from the trunk. From what I read from folks whose tree had this issue the tree was outside for a period and then brought inside but they didn't say what the temps, humidity or anything else was. I too have seen a similar problem but I can't remember where or what. Just another of Mother Natures mysteries I suppose.
It's tough to tell emotion from a post, I'm not trying to be rude in any way and apologize if it came off that way. I thought that other post's pictures looked the same to me. Or at least similar.Your problem is totally different to that other post, which required a different answer from Chuck. He has looked at YOUR plant (as I have) as a separate issue.
I really hope you don`t have too many more problems you might need help with
I would scrape away a little more soil, just enough to expose the total flare.
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