What is a disadvantage of a thick layer of thatch?

A thick layer of thatch can create an environment that is conducive to the development of insects and diseases. Thatch, which consists of a buildup of organic matter such as grass clippings, roots, and other plant materials, can impede water and nutrients from reaching the soil. Additionally, the thick layer can trap moisture and heat, making it a perfect breeding ground for pests and pathogens.

As it relates to insects, certain species thrive in the warm, moist conditions created by excessive thatch, which can lead to infestations that damage turf. Diseases can also proliferate in such environments due to the lack of airflow and proper drainage, leading to conditions that favor fungal growth, for example.

While thatch does have some benefits, such as water retention and insulation for the soil, the disadvantages of excessive thatch primarily outweigh these benefits when it comes to maintaining healthy turfgrass.