Why would fungicides be applied before visible evidence of a disease is noticed?

Why would fungicides be applied before visible evidence of a disease is noticed?

• A. To prevent any disease anywhere
• B. They are cheap
• C. Certain diseases tend to appear at the same time each year
• D. Because pests are always present

Answer: (C)

Fungicides are used ahead of problems when disease pressure is predictable. Many turf diseases have seasonal patterns, so conditions like temperature and moisture during a certain time of year create a high risk of infection. Applying fungicides before visible symptoms appear provides a protective barrier, preventing spores from successfully infecting tissues and establishing disease. Once symptoms show up, infection is already underway, and sprays are often less effective or require more aggressive treatment, so timing it to coincide with the high-risk period is the most effective strategy. The other ideas don’t fit because fungicides aren’t meant to prevent every possible disease everywhere, cost isn’t the primary reason for preemptive use, and disease management is not driven by pests being constantly present.

Fungicides are used ahead of problems when disease pressure is predictable. Many turf diseases have seasonal patterns, so conditions like temperature and moisture during a certain time of year create a high risk of infection. Applying fungicides before visible symptoms appear provides a protective barrier, preventing spores from successfully infecting tissues and establishing disease. Once symptoms show up, infection is already underway, and sprays are often less effective or require more aggressive treatment, so timing it to coincide with the high-risk period is the most effective strategy.

The other ideas don’t fit because fungicides aren’t meant to prevent every possible disease everywhere, cost isn’t the primary reason for preemptive use, and disease management is not driven by pests being constantly present.