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Maintaining a healthy lawn in July can be challenging, especially when fungal diseases start to appear. Recognizing common lawn fungi early helps in effective management and prevents widespread damage. Zone 7, with its warm summers and moderate humidity, is prone to specific fungal issues during this month.
Common Lawn Fungi in July for Zone 7
Several fungi are prevalent in lawns during July in Zone 7. These fungi thrive in the warm, humid conditions typical of summer. Identifying them early allows for timely intervention and better lawn health.
Brown Patch (Rhizoctonia solani)
Brown Patch is one of the most common lawn fungi in July. It appears as large, irregular patches of dead grass, often with a darker border. The patches can be several inches to a foot in diameter. The fungus thrives in hot, humid weather and can cause significant damage if untreated.
Signs include:
- Circular or irregular patches of brown, dead grass
- Fungal mycelium visible as a reddish-brown ring around patches
- Rapid expansion during humid nights
Dollar Spot (Sclerotinia homoeocarpa)
Dollar Spot appears as small, silver-white spots about the size of a silver dollar. These spots often merge to form larger patches. The grass may appear sunken or bleached.
Signs include:
- Round, white or tan spots with a darker border
- Thin, straw-colored grass within the patches
- Presence of a cottony, white fungal growth in humid conditions
Gray Leaf Spot (Pyricularia grisea)
Gray Leaf Spot manifests as elongated, grayish lesions on grass blades. It mainly affects St. Augustine, Bermuda, and Zoysia grasses. The disease causes leaf blades to die back, weakening the turf.
Signs include:
- Gray or tan lesions on leaves
- Lesions with dark borders
- Yellowing of surrounding grass
How to Identify Lawn Fungi
Proper identification involves observing the symptoms and signs on the grass. Look for patches, discoloration, and fungal growth. Using a magnifying glass can help spot fungal mycelium or spores. Monitoring environmental conditions such as moisture and temperature is also crucial.
Prevention and Management Tips
Preventing fungal infections involves cultural practices and, if necessary, chemical treatments. Maintain proper mowing height, ensure good drainage, and avoid overwatering. Applying fungicides may be required for severe cases, but always follow label instructions.
Cultural Practices
- Water early in the day to reduce humidity
- Keep grass at recommended heights for your grass type
- Improve soil drainage to prevent excess moisture
- Remove thatch buildup to promote air circulation
Chemical Treatments
- Use fungicides labeled for specific fungi
- Apply according to manufacturer instructions
- Rotate fungicides to prevent resistance
- Consult local extension services for recommendations
Early detection and proper management are key to maintaining a healthy lawn during the summer months in Zone 7. Regular monitoring and good cultural practices can significantly reduce the impact of lawn fungi.