When should fungicides be applied to effectively control Fusarium patch?

Fusarium patch, a common turf disease often seen in cool, moist conditions, requires careful timing for fungicide application to be effective. Applying fungicides when heavy rain is expected or after the first frost is beneficial because these conditions can exacerbate the development and spread of the disease.

Heavy rainfall can create an environment conducive to disease by increasing moisture levels in the grass, which is why applying fungicides in anticipation of rain can help protect the turf from infection as the product will have a better chance of being absorbed before the rain washes it away or dilutes its effectiveness.

Similarly, the first frost signifies a seasonal change in plant growth and stress, often coinciding with an increased incidence of diseases like Fusarium patch. Applying fungicides at this time can help prepare the turf for the stress of winter and prevent infections before they take hold.

Choosing either of these timing strategies ensures that the fungicide has the highest likelihood of controlling Fusarium patch effectively, as both scenarios aim to mitigate conditions that favor disease development.