Why does thatch buildup promote diseases in turf?

Why does thatch buildup promote diseases in turf?

• A. It cleans soil and reduces inoculum
• B. It doesn't affect inoculum
• C. Many fungi live as saprophytes in thatch, increasing inoculum
• D. It repels insects that carry disease

Answer: (C)

That buildup creates a damp, sheltered microclimate and serves as a reservoir for fungi that live on dead plant material. These saprophytic fungi persist in thatch, producing large amounts of inoculum (spores and other propagules) that can infect actively growing turf when conditions are right. The thick thatch layer also keeps the leaf surfaces wet longer and reduces air movement, which favors disease development after irrigation or rain. So, diseases are promoted because thatch increases the amount of inoculum and creates environmental conditions that help pathogens infect the turf.

That buildup creates a damp, sheltered microclimate and serves as a reservoir for fungi that live on dead plant material. These saprophytic fungi persist in thatch, producing large amounts of inoculum (spores and other propagules) that can infect actively growing turf when conditions are right. The thick thatch layer also keeps the leaf surfaces wet longer and reduces air movement, which favors disease development after irrigation or rain. So, diseases are promoted because thatch increases the amount of inoculum and creates environmental conditions that help pathogens infect the turf.