black spots on silver maple leaves

Hello,
The silver maples in our front yard are developing black spots on the leaves. Not knowing any better, I'd guess this is some kind of fungus. How big of a concern is this?
In case the details matter: Madison, WI zone 4 or 5 depending on who you believe clay soil
Thank you very much!
Ted Shoemaker
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Black leafspots on maples that are due to fungal infections (anthracnose, tar spot, Phyllosticta leaf spot) are usually only seen in the spring following a period of wet weather. Fungal problems can occur at other times if there has been a period of unusually rainy weather. They are not a great cause for concern as they cause minimal damage to the tree. sed5555
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Leaf damage this late in the season is no great concern on any deciduous plant. The tree "gave up" on the leaves sometime in mid-September, and they are not really contributing anything to the tree right now - essentially just waiting to drop off at this point. If you want to try to thwart something from starting up next spring, you could be especially anal about collecting all the dropped leaves and getting them out of your yard. By the way, there have been some fascinating television specials on the things plants do to protect themselves from insects and disease. Usually, the first juicy leaves of the season are the most productive as far as photosynthesis goes - but as voracious insects and diseases attack them, the plants respond by putting various kinds of poison in their leaves to thwart the pests. Unfortunately, those additives cut back on the efficiency of photosynthesis to a certain extent.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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.