Plan the perfect garden with our interactive tool →

How to Treat a Quaking Aspen with Leaf Spots

Medioimages/Photodisc/Photodisc/Getty Images

The poor quaking aspen has so many disease problems it's a wonder there are any around to grow in cultivation. With thin bark, the slightest encounter with a lawn mower or weed-eater or even a speck of a hole from an insect can lead to life-threatening fungal diseases. One of the most serious foliar diseases of the quaking aspen is black leaf spot, caused by a Marssonina, a fungus. Symptoms include dark spots on the foliage in spring that eventually grow together to form large dead areas.

Step 1

Clean the garden bed in fall to remove all fallen leaves and twigs. The fungus overwinters in garden debris.

Step 2

Spray the quaking aspen tree with a fungicide containing mancozeb chlorothalonil. Apply the first treatment when the buds begin to open in spring and repeat every two weeks, unless the fungicide package states otherwise. Fungicide won't cure the disease, but it will protect new foliage from becoming infected.

Step 3

Water the quaking aspen tree at the soil to keep water off the foliage. If you must water overhead, do so in the morning so that the leaves have time to dry before sundown.

  • Clean the garden bed in fall to remove all fallen leaves and twigs.
  • Apply the first treatment when the buds begin to open in spring and repeat every two weeks, unless the fungicide package states otherwise.

Related Articles

Are Chinese Palm Plants Poisonous to Cats?
Are Chinese Palm Plants Poisonous to Cats?
How to Keep a Fuchsia Over Winter
How to Keep a Fuchsia Over Winter
How to Transplant Croton
How to Transplant Croton
White Fungus on a Japanese Maple
White Fungus on a Japanese Maple
Can I Grow Avocados in Midwest Illinois?
Can I Grow Avocados in Midwest Illinois?
Can Maple Trees Grow in Montana?
Can Maple Trees Grow in Montana?
How to Care for a Corkscrew Willow Tree
How to Care for a Corkscrew Willow Tree
What Weed Killer Kills Buckthorn?
What Weed Killer Kills Buckthorn?
How to Care for an Inaba Shidare Japanese Maple Tree
How to Care for an Inaba Shidare Japanese Maple Tree
Are Leaves Good as a Fertilizer for a Garden?
Are Leaves Good as a Fertilizer for a Garden?
When to Plant Red Potatoes in Mississippi
When to Plant Red Potatoes in Mississippi
How to Get Rid of Black Mold on a Magnolia Tree
How to Get Rid of Black Mold on a Magnolia Tree
How Long Do Sequoia Trees Live?
How Long Do Sequoia Trees Live?
Garden Guides
×