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Take all root rot Fungal Root Disease

Gaeumannomyces graminis var. graminis

Take-All Root Rot is a fungal root disease that weakens turf by damaging the roots, stolons, and lower stems. It is most common in warm-season lawns such as St. Augustine, bermuda, zoysia, and centipede, especially when grass is stressed by poor soil conditions, improper pH, heavy thatch, shade, or wet weather.

Disease

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What Take all root rot Looks Like

Take-All Root Rot usually appears as yellow, thinning, or weak patches in the lawn. The damaged areas may look irregular, wilted, drought-stressed, or slow to recover even when watering seems adequate.

In St. Augustine and other warm-season grasses, the turf may turn yellow-green, then brown or straw-colored as the roots decline. The grass may pull up more easily than healthy turf because the root system is damaged. Roots may appear short, dark, rotted, or weak instead of white and healthy.

Why It Spreads

Take-All Root Rot develops when fungal activity combines with turf stress. It is often worse in lawns with compacted soil, poor drainage, excessive thatch, shade, high soil pH, poor fertility balance, or repeated stress from drought, overwatering, or improper mowing.

The disease attacks the root system, which limits the lawn’s ability to take up water and nutrients. Symptoms often become more noticeable during periods of heat, drought, heavy rain, or spring transition when the lawn is trying to grow but the roots are already weakened.

How to Prevent It

Prevent Take-All Root Rot by building a healthier root zone and reducing stress on the turf. Avoid overwatering, improve drainage, reduce compaction with core aeration, and manage thatch when needed.

Maintain proper mowing height for your grass type, avoid scalping, and follow a balanced fertilizer program. Soil testing can be especially helpful because pH and nutrient imbalances can make root diseases worse. Avoid excessive lime applications unless a soil test shows it is needed.

Best timing: Spring through early summer before heat, wet weather, or stress exposes root damage.

How to Control It

Use a fungicide labeled for Take-All Root Rot and safe for your specific lawn type. Because this disease affects the roots, fungicide applications often need to move into the root zone, so follow the label closely for watering-in directions.

For best results, combine fungicide treatment with cultural improvements such as correcting drainage, reducing compaction, improving fertility balance, and avoiding turf stress. Severe areas may take time to recover because the lawn must regrow a healthier root system.

Best timing: At the first sign of yellowing, thinning, weak roots, or irregular declining patches during active growth.

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Frequently Asked Questions

What causes Take-All Root Rot?

Take-All Root Rot is caused by a fungal pathogen that attacks the roots and lower parts of the grass plant. It is often worse when lawns are stressed by compacted soil, poor drainage, high soil pH, excessive thatch, shade, or improper watering.

What does Take-All Root Rot look like?

Take-All Root Rot often looks like yellow, thinning, weak, or drought-stressed patches in the lawn. The roots may be short, dark, rotted, or weak, and the grass may pull up more easily than healthy turf.

How do I fix Take-All Root Rot?

Improve drainage, reduce compaction, avoid overwatering, maintain proper mowing height, and follow a balanced fertilizer program. Apply a fungicide labeled for Take-All Root Rot when needed, and water it into the root zone according to the label.