名媛直播

I harvested a 2-leaf stage new seedling this summer from under a Bloodgood JM: appears to be Acer palmatum, or Acer palmatum ‘Atropurpurpeum’ seedling. Managed reasonably well in the wet/hot St Louis summer, but I just noted yellowing patches on some leaves (one possible cause is morning sprinkler exposure which I stopped) - - took a photo and higher magnification shows minute black spots - suspect fungal, potentially early lesions of Anthracnose, Phyllosticta, or Tar Spot - will see what develops. I know Neem oil may injure maples and this is a young unhardened seedling, but opted to spray with dilute Neem concentrate 1Tbsp per gallon and keep in shade away from sprinklers. Any ideas re the cause - am I on the right track? Neem seems a general coverage if the seedling will tolerate - I may consider change to pyrethrin/sulfur spray or a copper fungicide spray if Neem adversely affects the leaves in the days ahead or if the involved leaves worsen. Just attempting the challenge of raising a maple bonsai from natural seedling harvest. Should I remove involved leaves, the upper, newer leaves have no lesions yet - no debris on the soil surface

Why is it in a bonsai pot?

just to start it and had pot available when the seedling was at the 2 leaf stage - testing to see if I could I guess; read it was possible to maintain but would extend time frame to a potted tree, or bonsai; point taken - likely added to the stress on the seedling and delayed growth development; recognize not best, planned to transplant out or see what would develop, so I learned...
also, reading web, checking photos - recognized this is not a palmatum; lesson also learned not to assume outdoor harvest near a variety equals same variety
haven't worked with small trees in years- learned a lot on this one
does appear fungal to me

mardrdr wrote: n this one
does appear fungal to me

I didn't know so I Googled for images of leaves with yellow spots with black dots.
This looks idential, and indeed, it's tar spot.

yes, looks like it - have to say, making a foray back into bonsai, small tree the learning curve is steep
Thanks