Chemical Control of Anthracnose and Other Leaf Diseases
Anthracnose, a common fungal disease, affects the leaves, stalks, and fruits of various tree species. This disease is typically identified by black or brown spots on leaves, twig dieback, and premature leaf drop. The spores of this fungus spread via wind or rain, and specific types of anthracnose are named after the trees they infect, such as sycamore anthracnose, maple anthracnose, and oak anthracnose.
American Arborist-Anthracnose
In wet, warm spring conditions, the fungal pathogen thrives and spreads to newly developed leaves. While some forms of anthracnose can cause significant damage, others are relatively harmless. Over time, severe cases can weaken trees by disrupting energy production, leading to eventual death.
How to Identify Anthracnose
Anthracnose is usually easy to recognize by its hallmark symptoms: discolored spots on leaves, twig dieback, and early leaf drop. However, these symptoms can sometimes be mistaken for drought stress or other environmental issues. A definitive way to diagnose anthracnose is to check for fungal spores growing from lesions on leaves or significant twig death. Early identification is key to managing this disease effectively.
Our Solution for Anthracnose Control
At American Arborist, we offer targeted chemical treatments to combat anthracnose and similar leaf diseases. The cornerstone of effective control is a copper-based foliar spray applied at precisely the right time. Timing is critical for success:
First Application: At bud break—when trees begin to leaf out in early spring.
Follow-Up Sprays: Two additional applications are made, each spaced two weeks apart.
If you’ve noticed symptoms of anthracnose on your trees, now is the time to act. Our team can design a tailored treatment plan to ensure effective disease management.
Why Timing Matters
Imagine you have a 14-inch diameter pear tree in your front yard. Each year, you notice brown or orange lesions on the leaves, early leaf drop, and twig death. By mid-July, you call us to assess your tree and develop a care plan. Unfortunately, at this point, the fungal pathogen has already taken hold, and chemical control is no longer viable for the season.
The key lesson here is that treatment must begin early—before the disease has a chance to spread. Applying sprays after bud break drastically reduces their effectiveness. This is why we recommend scheduling tree care plans during the fall or winter to ensure treatments are timed perfectly in the spring.
Proactive Tree Care: The Best Approach
The ideal scenario is scheduling a property assessment in the fall or winter. This allows us to identify fungal pathogens accurately and create a comprehensive management plan. Acting early maximizes the effectiveness of treatments and helps protect your trees and surrounding landscapes from further infection. Left untreated, anthracnose can spread through wind and water, threatening multiple trees within your community.
At American Arborist, we’re dedicated to protecting the urban tree canopy and ensuring your trees receive the best care possible. By reaching out for a property assessment and treatment quote this winter, you’ll be taking the first step in safeguarding your landscape for the coming year.
Act Now for 2025 Treatment Plans
If you suspect anthracnose or other leaf diseases are affecting your trees, don’t wait until it’s too late. Contact us today to schedule an assessment and secure your treatment plan for 2025. Together, we can mitigate the impact of these diseases and preserve the beauty and health of your trees for years to come.