brown spots on maple leaves
 

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
kingdom.

whole leaf:
http://geocities.com/intiharj/leaf001.jpg (87k)
http://geocities.com/intiharj/leaf002.jpg (81k)

close-up:
http://geocities.com/intiharj/leaf003.jpg (50k)
http://geocities.com/intiharj/leaf004.jpg (45k)

Thanks in advance,

John

brown spots on maple leaves
 

"John" wrote in message
...
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
kingdom.

whole leaf:
http://geocities.com/intiharj/leaf001.jpg (87k)
http://geocities.com/intiharj/leaf002.jpg (81k)

close-up:
http://geocities.com/intiharj/leaf003.jpg (50k)
http://geocities.com/intiharj/leaf004.jpg (45k)

Thanks in advance,

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:
http://www.extension.umn.edu/project...nosemaple.html

brown spots on maple leaves
 

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:

http://www.extension.umn.edu/project...nosemaple.html

Thanks Vox,

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
another site
(http://www.glfc.cfs.nrcan.gc.ca/tree...af_spot_e.html):

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:
http://maple.dnr.cornell.edu/images/diseases/dis4.jpg

John

brown spots on maple leaves
 

"John" wrote in message
...
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:


http://www.extension.umn.edu/project...nosemaple.html

Thanks Vox,

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
another site

(http://www.glfc.cfs.nrcan.gc.ca/tree...af_spot_e.html):

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:
http://maple.dnr.cornell.edu/images/diseases/dis4.jpg

John

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.

brown spots on maple leaves
 

Tar spot - cosmetic fungal disease. No worries. Let it go.

--
Mike LaMana, MS
Heartwood Consulting Services, LLC
Toms River, NJ
www.HeartwoodConsulting.net



"John" wrote in message
...
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
kingdom.

whole leaf:
http://geocities.com/intiharj/leaf001.jpg (87k)
http://geocities.com/intiharj/leaf002.jpg (81k)

close-up:
http://geocities.com/intiharj/leaf003.jpg (50k)
http://geocities.com/intiharj/leaf004.jpg (45k)

Thanks in advance,

John