Aspen Leaf Spot Management

Once you know you have aspen leaf spots on your trees and plants, you will need to take action. While the initial infection is not as dangerous, the fungus will spread if allowed. If you have a warmer spring, you will want to take action sooner rather than later. It’s also worth making sure the infection is gone by the fall to prevent it hibernating during the winter. Here are some aspen leaf spot management options:

Start with Resistant Variety of Plants and Trees

The best way to manage the disease is to prevent it completely. There are now various resistant breeds of cottonwoods and aspens, as they have been specifically created as hybrids. Your local nursery will be able to offer advice and share the best trees to plant in your area.
There are some aspens that are now resistant to the aspen leaf spots. However, it can be hard to make sure you have the right trees in the first place.

Plan Ahead with Planting

When planting, make sure you leave enough space between the trees. You want to give them space to breathe, so they don’t create a vacuum that offers a warm breeding ground for the fungus.
Those who don’t have choice about planting location, will need to take the following management steps.
Remove the Fallen Infected Leaves
During the fall is the best time to take action for aspen leaf spot management. Start with the removal of the infected leaves and twigs that fall. Absolutely anything that had signs of the fungus will need to be taken away and burned. The disease will stick around throughout the winter and return next spring. Other leaves will need to be kept as dry as possible. Moisture and heat offer the best breeding ground for the fungus. Irrigate first thing in the morning, giving the leaves the chance to dry out throughout the day. If you use sprinklers, avoid constantly sprinkling the trees so they don’t remain damp.
If you do spot the fungus, you can spray fungicides to prevent the spread. Make sure you spray every 12-14 days. When your infection is more serious, you will need to contact a tree surgeon for more effective and efficient management methods. If you have any question about tree disease and tree spraying, contact SprayTech.