There are 3 things that need to be present for disease to attack turfgrass.
#1 Host– there needs to be a host, susceptible turfgrass
#2 Environment– favorable condition for pathogen and disease development such as temperature, moisture levels, available or lack of sunlight and airflow
#3 Pathogens– fungal pathogens need to be present. Fungal pathogens can be naturally occurring in the soil table as well as be transported by wind, rain, shoes and mower blades and wheels.
Disease can be managed most times by changing the environment i.e. changing watering habits thus no chemical control is needed allowing us to follow our IPM philosophy as we view ourselves as stewards to the environment. However once all IPM non pesticide options have been exhausted or in extreme cases we can apply a fungicide to remedy the problem however we will never blanket apply a fungicide, we will only apply the product where needed to control the disease.