Which term increases the risk of several turf diseases?

Which term increases the risk of several turf diseases?

• A. Excessive nitrogen fertilizer
• B. Frequent mowing
• C. Regular aeration
• D. Adequate irrigation

Answer: (A)

Nitrogen levels directly influence how turf grows and how it interacts with diseases. When you apply too much nitrogen, the grass shoots up quickly and develops lush, soft, succulent tissue and a dense canopy. That dense growth tends to stay wet longer after irrigation or dew, increasing leaf wetness time, which many turf pathogens need to infect. The excess growth also encourages a thick thatch layer; thatch creates a sheltered, moist microclimate and reduces air movement, both of which favor fungi and other pathogens. Additionally, oversized growth can weaken roots and reduce the plant’s overall stress tolerance, making it more susceptible to disease stress when pathogens are present. In contrast, proper nitrogen management helps keep growth balanced, improves rooting, reduces excessive thatch, and promotes better air flow and drainage, all of which lower disease risk. Regular mowing, adequate irrigation, and aeration contribute to healthier turf by maintaining appropriate density and airflow, rather than creating the conditions that excess nitrogen does.

Nitrogen levels directly influence how turf grows and how it interacts with diseases. When you apply too much nitrogen, the grass shoots up quickly and develops lush, soft, succulent tissue and a dense canopy. That dense growth tends to stay wet longer after irrigation or dew, increasing leaf wetness time, which many turf pathogens need to infect. The excess growth also encourages a thick thatch layer; thatch creates a sheltered, moist microclimate and reduces air movement, both of which favor fungi and other pathogens. Additionally, oversized growth can weaken roots and reduce the plant’s overall stress tolerance, making it more susceptible to disease stress when pathogens are present.

In contrast, proper nitrogen management helps keep growth balanced, improves rooting, reduces excessive thatch, and promotes better air flow and drainage, all of which lower disease risk. Regular mowing, adequate irrigation, and aeration contribute to healthier turf by maintaining appropriate density and airflow, rather than creating the conditions that excess nitrogen does.