Integrated Pest Management
Ascochyta Leaf Blight
Hosts, Symptoms & Signs
- affects all species of grass
- leaves die back from the tip, resulting in brown patches of grass
- does not cause permanent damage
- symptoms can occur at any time but are more commonly seen during hot, dry weather
- top third of leaf blade dies back, and the area between diseased and healthy tissue is slightly constricted
- fruiting structures develop on dead grass blades
- overwinters in plant debris and thatch
- spores are released from fruiting structures during wet weather and are dispersed by splashing water and lawn mowers
- infections occur on the newly cut end of the grass blade
- Reduce thatch with proper cultural practices.
- Improve water penetration by aerification.
- Maintain sharp mower blades to reduce wounding of grass; reduce mowing frequency during an outbreak.
- Implement a balanced fertilizer program; avoid excessive nitrogen, especially in the spring.
- Avoid drought stress as well as excessive irrigation.