What describes the role of irrigation in managing necrotic ring spot?

What describes the role of irrigation in managing necrotic ring spot?

• A. Frequent heavy irrigation reduces disease pressure
• B. Irrigation has no effect on disease
• C. Proper irrigation that avoids leaf wetness reduces disease pressure
• D. Irrigation is irrelevant to disease management

Answer: (C)

Leaf wetness duration is a key driver of necrotic ring spot development. The fungus that causes this disease needs a wet leaf surface to germinate and infect, so keeping foliage dry limits infection opportunities. Proper irrigation achieves soil moisture without creating prolonged leaf wetness—deep, infrequent watering combined with scheduling that allows leaves to dry quickly (such as morning irrigation and possibly non-foliar methods like drip or subirrigation). By avoiding leaf wetness, you reduce the conditions that favor the pathogen, lowering disease pressure.

Leaf wetness duration is a key driver of necrotic ring spot development. The fungus that causes this disease needs a wet leaf surface to germinate and infect, so keeping foliage dry limits infection opportunities. Proper irrigation achieves soil moisture without creating prolonged leaf wetness—deep, infrequent watering combined with scheduling that allows leaves to dry quickly (such as morning irrigation and possibly non-foliar methods like drip or subirrigation). By avoiding leaf wetness, you reduce the conditions that favor the pathogen, lowering disease pressure.