What organism causes St. Augustine decline in lawns?

St. Augustine decline is primarily caused by a viral pathogen, specifically the St. Augustine grass stunting virus. This virus affects the health and vigor of St. Augustine grass, leading to symptoms such as yellowing, stunted growth, and overall decline of the lawn. Understanding that viruses can significantly influence plant health is crucial for effective pest management and for maintaining healthy lawns. The viral nature of this disease differentiates it from issues caused by bacteria, fungi, or insects, which would present different symptoms and require alternative control measures. Implementing appropriate cultural practices, such as proper irrigation, fertilization, and mowing, can help manage and potentially minimize the impact of this viral disease on St. Augustine grass.