Why rotate MOAs when applying fungicides for dollar spot control?

Why rotate MOAs when applying fungicides for dollar spot control?

• A. To save money
• B. To reduce required water
• C. To prevent resistance development
• D. To increase coverage speed

Answer: (C)

Rotating fungicides by using different modes of action is a resistance-management strategy. When you apply the same fungicide group repeatedly, the dollar spot pathogen is pressured to survive that exact action, so resistant individuals outcompete sensitive ones and the product becomes less effective over time. By switching to products with different modes of action, you interrupt that adaptation process, making it harder for the pathogen to develop resistance and helping maintain control efficacy longer. This approach isn’t primarily about saving money, reducing water, or speeding up how quickly coverage happens. Those factors aren’t the goal of MOA rotation; the aim is to preserve fungicide effectiveness by slowing resistance development.

Rotating fungicides by using different modes of action is a resistance-management strategy. When you apply the same fungicide group repeatedly, the dollar spot pathogen is pressured to survive that exact action, so resistant individuals outcompete sensitive ones and the product becomes less effective over time. By switching to products with different modes of action, you interrupt that adaptation process, making it harder for the pathogen to develop resistance and helping maintain control efficacy longer.

This approach isn’t primarily about saving money, reducing water, or speeding up how quickly coverage happens. Those factors aren’t the goal of MOA rotation; the aim is to preserve fungicide effectiveness by slowing resistance development.