Ornamental and Turf Pesticide Applicators Practice Exam

Which statement about thatch is false?

1. Thatch should be at least 2 inches thick to keep soil cool

2. Thatch can restrict root growth

3. Thatch provides moisture retention

4. Thatch should be managed for healthy turf

The correct answer is: Thatch should be at least 2 inches thick to keep soil cool

The statement that thatch should be at least 2 inches thick to keep soil cool is false. In reality, thatch does not need to reach such a thickness to serve its purpose, and excessive thatch can lead to several problems rather than benefits. A layer of thatch that is too thick can create an environment that is conducive to turf problems, including restricting root growth and promoting the conditions for disease development. Thatch can indeed provide benefits, such as moisture retention, but this is typically effective only within a certain range. If the thatch layer becomes overly thick, it can impede water and nutrient absorption, making it more difficult for the roots to access necessary resources. Therefore, managing thatch is crucial for maintaining healthy turf, as well as for ensuring proper aeration and root growth. Understanding the role of thatch is essential in turf management, as it can influence the overall health and appearance of the lawn. Regular maintenance practices, such as dethatching, are recommended to keep thatch at an appropriate level, which supports healthy turf and optimal growing conditions.