I have a newly planted maple tree (not sure what kind) from a nursery that
has brown spots on just about every leaf. The tree is about 10 feet tall.
I'm in central Virginia and the tree is way out in the country about 30 feet
from a pond in an open field. The following links show a typical leaf from
this tree with a couple of shots I was able to take through a microscope.
The brown spots are mostly circular with very small black bumps. I was not
able to detect any critters or other moving objects on the leaf. Does
anyone know what these are and if the tree is in trouble? I'm sorry if I'm
not providing any obviously critical info, but I know little of the plant
We have had an unusually cool, wet spring and the maples here (Cincinnati)
are exhibiting sighs of fungal disease. Your tree probably has anthracnose.
It shouldn't be fatal to the maple, although it will kill native dogwoods
(cornus florida). Here is a link with some pictures:
After looking at the pictures and the descriptions, I'd lean toward
Phyllosticta (Phyllosticta minima), because of the black dots that are clear
in the pictures I took. I also found this description of Phyllosticta from
Spots on infected leaves are brown with surrounding purple borders. They may
be circular or irregular in shape and 5-10 mm in diameter. Tiny black
fruiting bodies are scat- tered over the surface of the spots. Occasionally,
the dried-up central portions of the spots crack and fall out before the end
of the summer.
Here's another picture of Phyllosticta minima from another site that looks
very much like what my tree has:
You're probably right. I didn't look too closely at your pictures. The
problem here is probably phyllosticta also, although anthracnose is pandemic
in this area. My neighbor brought over some maple leaves last week with
what looked like phyllosticta and my sycamore definitely has anthracnose.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.