Lawn Disease Control Guide
What causes lawn disease, how to spot it early and the simple habits that keep fungus from taking hold.
Lawn diseases are caused by fungi that live in almost every lawn. They only become a problem when conditions line up: warm, humid weather, long periods of wet grass, too much nitrogen at the wrong time, or grass that's already stressed.
The good news is most disease can be prevented with the right watering, mowing and feeding habits. When disease does show up, a lawn care company can identify it and treat it before it spreads across the yard.
What it includes
- Diagnosis of spots, rings and patches
- Preventive fungicide in high-risk seasons
- Curative treatments for active disease
- Watering schedule recommendations
- Mowing height and blade advice
- Fertilizer timing that lowers disease risk
- Aeration to improve drainage
- Overseeding with disease-resistant varieties
How the service works
Diagnose
The technician looks at the pattern, color and leaf lesions to identify the disease.
Fix the cause
Watering, mowing or fertilizer habits that encourage disease are adjusted first.
Treat
A fungicide matched to the disease is applied when the damage or risk justifies it.
Rebuild
Damaged areas recover or are reseeded with resistant grass once conditions improve.
When disease shows up
In cool-season lawns, brown patch and dollar spot show up during hot, humid summer stretches, especially on lawns watered in the evening. Snow mold can appear in spring after long snow cover in the North.
In warm-season lawns, large patch shows up in spring and fall when the weather swings between cool nights and warm days, and is most common in zoysia and St. Augustine.
Questions to ask a lawn care company
- What disease do I have, and what caused it?
- Is fungicide included in my program, or extra?
- What should I change about watering and mowing?
- Will the grass recover on its own or need reseeding?
Common questions
What's the best time of day to water?
Early morning, before about 10 a.m. Grass dries during the day. Evening watering leaves the lawn wet overnight, which is ideal for fungus.
Will brown patch kill my lawn?
Usually not. In most cases the roots survive and the grass recovers when weather cools. Severe cases can thin the lawn and may need overseeding.
Does every lawn need fungicide?
No. Most lawns stay healthy with good care. Fungicide makes sense for lawns with a history of disease or when an outbreak is spreading.
Can mowing spread lawn disease?
Yes. Mowing wet, infected grass can carry spores to other areas. A sharp blade and mowing when the grass is dry both help.
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