Anthracnose

What is Anthracnose

1. Anthracnose attacks grass plants (normally only Poa annua) when they are under environmental stress.
2. Disease is triggered by low nutrition and compaction, leading to reduced turf vigor.
3. Once disease reaches the basal rot stage fungicides are no longer effective for control of disease, but should be applied to prevent further attack.

Approach

1. Turf should have sufficient nutritional input coming into the end of the growing season.
2. Using a slow-release fertilizer late in the season ensures that adequate nutrition is in the soil to promote healthy turf.
3. Avoid low heights of cut.
4. Minimize mechanical cultivation during periods of stress. Aerate to relieve compaction and improve oxygen levels; minimize Poa annua population in the sward.
5. Overseed with less susceptible varieties.
6. Irrigate in the morning to minimize long periods of leaf wetness overnight. Use penetrant wetting agents to move water through the soil profile and to keep the surface dry.
7. Use fungicides as part of an IPM program and be aware of causing resistance to one chemical group by its regular use.