Natural pastures are prone to diseases from spring through autumn, typically caused by the presence of organic matter. The first and most important step is to remove this organic material from the grassland. During the summer, high temperatures and humidity create favorable conditions for many pests and pathogens to thrive. Most diseases in natural lawns are caused by plant-parasitic fungi, which often reside in the soil, dead leaves, and decaying grass roots. When environmental conditions become suitable, these fungi can become active and multiply rapidly.
To prevent disease outbreaks, it's essential to select high-quality grass seeds and manage the early growth stages carefully. This includes controlling factors such as the amount and timing of fertilization, watering schedules, mowing practices, and crop density. Any mistake in these steps can create an environment conducive to disease development. For example, improper cutting or leaving grass clippings on the field can increase the risk of infections.
The table below outlines common lawn diseases, their occurrence periods, conditions, control methods, and prevention strategies:
| Disease Name | Time | Occurrence Conditions | Control Methods | Prevention Methods |
|-------------------|------------------|-------------------------------|--------------------------------|--------------------------------------|
| Brown Spot | May to September | High temperature, moist | LDP or LDP + Fert | Improve drainage, deep watering |
| Money Spot | May to October | 15–28°C, warm weather | LDP or LDP + Fert | Prevent subtilis layer, deep watering |
| Fusarium | June to September| High temperature and humidity | N/A | Improve soil aeration, reduce weeds |
| Leaf Spot | Early summer/autumn| Cold, wet, cloudy | LDP or LDP + Fert | Reduce shading, improve aeration |
| Rust | May to June | 20–25°C, light and warmth | LDP or LDP + Fert | Recover damaged areas |
| Powdery Mildew | March to October | Poor ventilation, high humidity | N/A | Improve air circulation, sunlight |
| Spring Spot | March to May | Dry, windy | LDP or LDP + Fert (last year) | Apply treatment in fall of previous year |
| Snow Mold | Early to late autumn | Wet, -5°C to 5°C | LDP or LDP + Fert | Improve drainage, remove debris |
| Ringworm Disease | Any time | High organic content, moist | N/A | Remove and recycle organic residue |
Note: LDP = Lawn Disease Preventative; Fert = Fertilizer.
By following these guidelines and maintaining proper lawn care practices, you can significantly reduce the risk of disease and ensure a healthier, more vibrant natural pasture. Regular monitoring and timely intervention are key to long-term success.
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