I am located in zone 6B (NYC). Container garden on the roof. Sun most of the day. Young tree, about 3-4 ft tall, started from one of those twigs that Arbor Day Org sends when you contribute. I don't remember what it is (marked with their purple ID), but it seems to be coming down with a leaf disease. Can anyone diagnose and suggest treatment? I already spray with Neem Oil but it doesn't seem to stop the spread. It's only on this one little tree. Thanks bigger picture here
Might be a crab apple tree with apple scab. The easiest thing would be to replace it with another kind, that does not get scabby.
Not a disqualification. Lack of flowering would be due to young age of specimen or other non-genetic circumstance and not an inherent characteristic of the kind of tree.
Arbor Day web site has trees they are offering shown and described, perhaps you can find and recognize yours there.
I just emailed them to find out. They're not open today. The tree is hard to identify visually...not very unusual. But the marking on the bark is purple...so they will know from that fact. thanks will get back with reply as soon as I hear from them. I removed all the leaves that were affected. It was spreading fast. 2/3 of the leaves were spotted. I don't recall getting any crab apple, but it is one of the trees they would send to my zone....so maybe it is. If so, do you really have to scrap the tree once it gets this condition? Can't it be treated somehow?
You were right. It's CrabApple. I just found out they painted crabapples purple that year. I have two of them. The other one is fine. The one that had the spots, I basically removed all the bad leaves off so it only has about 20% of its leaves, and the remaining ones are getting slowly slightly brown spotted...but not as bad as before. Could over watering have caused that problem? Although the other one was watered the same amount it is in a shadier location. In fact the one that has the problem was in a shadier location earlier in the season and it was still getting the spots. Then I moved it to a sunnier location. Could any of that contribute to the problem?
