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Make your ryegrass thicker by boosting soil health. Add organic matter, aerate the lawn if the soil is compacted, fertilize appropriately, and see if your lawn needs dethatching. Your local lawn care service can come and look at your lawn and provide specific advice and remedies for your lawn issues.

You should put pre-emergent herbicide and fertilizer on your lawn in the spring. Pre-emergent herbicide keeps weeds from taking root. Fertilizer helps your grass to grow lush and dense and blocks future weeds from growing. You can also add amendments, such as sulfur and lime, to enhance your soil quality. 

The best fertilizer for your lawn contains a balance of the nutrients your grass needs for long-term health. A soil test can tell you the optimum nutrient balance. However, to repair yellow grass quickly, assuming all it needs is fertilizer, apply a nitrogen-rich blend that promotes fast growth.

You can use a fungicide to help control powdery mildew, but you should apply it judiciously as it can damage soil health and persist in the soil. Most of the time, proper watering, surface drying, and limiting shade can control powdery mildew without needing harsher interventions. If you have a repeated problem with powdery mildew, you can also try planting a shade-resistant type of grass that will be less susceptible to the fungus.