• slide
  • slide
  • slide
  • slide
  • slide
  • slide
  • slide

Tar Spot on Maples

Don’t let black tar-like spots on the leaves of your maple tree make you fret. Although it’s one of the more noticeable diseases, it’s not detrimental to the vitality of healthy plants.

A European tar spot fungus found its way to North America and has become a common problem on Norway, striped and sycamore maples in parts of the U.S. and Canada. The North American native tar spot fungus is often seen on our native silver and red maples.  

The disease is more common in dense plantings and summers following a wet spring.  Although the symptoms appear early in the season they become more pronounced and noticeable over time. 

The disease-causing fungi survive the winter on the tar spot infected leaves lying on the ground. Rake and destroy the leaves to help reduce the source of infection. Increase success by getting your neighbors to do the same.

A bit more information: Anthracnose is another common problem on maples. This fungal disease causes irregularly shaped brown spots along the leaf veins. Infection usually occurs on younger growth and is prevalent on lower leaves. 

Upcoming Live Events
& Webinars


Feb. 28, 2024
FREE WEBINAR

Create a Beautiful Landscape Free of Invasive Plants in Wisconsin Gardens
Register now

Feb. 29, 2024
FREE WEBINAR

How to Plan Your Rain Garden
Register now

March 6, 2024
FREE WEBINAR

Growing Summer Bulbs in Containers
Register now

March 7, 2024
Wauwatosa Public Library

Wauwatosa, WI

March 13, 2024
FREE WEBINAR

Hydrangea Selection, Pruning & Care
Register now

March 14, 2024
FREE WEBINAR

How to Select Rain Garden Plants
Register now


March 20, 2024
FREE WEBINAR

Maximize the Beauty and Enjoyment
in Any Small Space
Register now

March 23, 2024

REALTORS Home & Garden Show
West Allis, WI

March 27, 2024
FREE WEBINAR

How to Start a Garden for Beginners
Register now

April 3, 2024
Franklin Public Library

Franklin, WI

April 10, 2024
FREE WEBINAR

Container Gardening Throughout the Year
Register now

April 11, 2024
FREE WEBINAR

7 Steps to Managing Water Where it Falls in Your Yard
Register now

April 20, 2024
Pasquesi Home & Gardens
Lake Bluff, IL

April 27, 2024
Ridges & Rivers Book Festival
Viroqua, WI

April 28, 2024
Ebert's Greenhouse Village
Ixonia, WI

May 1, 2024
FREE WEBINAR

Ornamental Fruits and Vegetables
Register now

WATCH ON-DEMAND WEBINARS

Learn More

Book an Appearance

Learn More

Enter to win Longfield Gardens bulbs valued at $157.00 !

ENTER NOW