Which management practice helps control biotic diseases in turfgrass?

Maintaining sharp mower blades is crucial for managing biotic diseases in turfgrass because dull blades can tear the grass rather than cut it cleanly. When grass blades are torn, it creates an entry point for pathogens, increasing the risk of disease. Sharp blades produce a clean cut, promoting healthier grass that can better withstand disease pressure.

Other choices, such as over-watering, can actually create favorable conditions for fungal diseases by keeping the turf excessively moist. Increasing nitrogen levels might promote lush growth but can also lead to increased susceptibility to certain diseases, particularly during warm and wet conditions. Leaving thatch unremoved can create an environment conducive to pests and diseases since thatch can hold moisture and provide a habitat for pathogens. Therefore, keeping mower blades sharp is a fundamental practice in preventing the spread of turfgrass diseases.