Spring 2025 brought an extraordinary amount of rainfall to Massachusetts, marking one of the wettest seasons in recent memory. While this deluge has alleviated drought conditions across much of the state, it has also created an environment ripe for the proliferation of lawn and tree diseases.

From Drought to Deluge: Massachusetts’ Changing Water Status

After enduring prolonged precipitation deficits since August 2024, Massachusetts has seen significant improvement in drought conditions due to above-normal rainfall this spring. Most regions, including the Western, Connecticut River Valley, Central, and Northeast, have returned to normal conditions. However, the Cape Cod region remains at Level 2: Significant Drought; and the Southeast and Islands regions are rated at Level 1: Mild Drought.

This influx of moisture has replenished waterways and groundwater levels, reducing potential fire dangers and benefiting the overall ecosystem.

The Downside: A Surge in Lawn and Tree Diseases

While the rain has been beneficial in many ways, the excessive moisture and humidity have created ideal conditions for various plant diseases to thrive.

Red Thread: A Common Lawn Foe

One such disease is Red Thread, caused by the fungus Laetisaria fuciformis. This disease is particularly prevalent in cool, moist conditions—exactly what this spring has provided.

What to Look For:

• Pink or red thread-like structures on grass blades
• Patches of tan or light brown grass
• Affected areas that may appear dead but are not

Red Thread primarily affects cool-season grasses like red fescue, ryegrass, Kentucky bluegrass, and bentgrass. While it doesn’t kill the grass, it can weaken it, making it more susceptible to other stresses.

Management Tips:

• Avoid excessive watering; let the lawn dry out between waterings
• Mow regularly and remove clippings to prevent spread
• Apply nitrogen fertilizer to promote healthy growth
• Consult with a lawn care professional for fungicide treatments if necessary

Foliar Diseases in Trees and Shrubs

Trees and shrubs are also at risk. The persistent wet conditions have led to an uptick in foliar diseases, which affect the leaves and can lead to defoliation and reduced vigor.

Common Foliar Diseases:

• Beech Leaf Disease: Caused by a foliar nematode, this disease leads to leaf damage and can eventually result in tree mortality.
• Anthracnose: A fungal disease that causes dark, sunken lesions on leaves, stems, flowers, or fruits.
• Leaf Spot Diseases: Characterized by discolored spots on leaves, often caused by fungi or bacteria.

Preventative Measures:

• Ensure proper spacing between plants to improve air circulation
• Prune affected areas and dispose of debris properly
• Apply appropriate fungicides as recommended by a professional
• Maintain overall plant health through proper fertilization and watering practices

Protect Your Landscape with Natural Tree and Lawn

At Natural Tree and Lawn, we understand the challenges that this unusually wet spring presents. Our team of experts is equipped to help you identify and manage these diseases, ensuring your lawn and landscape remain healthy and vibrant.

Our Services Include:

• Comprehensive lawn assessments
• Customized fertilization programs
• Disease identification and management
• Tree and shrub care, including pruning and disease control

Don’t let the rain dampen your landscape’s potential. Contact Natural Tree and Lawn today at 781-297-3674 to schedule a consultation and take proactive steps to protect your green spaces.

Note: The information provided in this blog is based on current data as of June 2025. For the most accurate and personalized advice, please consult with our professionals or local extension services.