For best results, apply these fungicides after rather than before mowing, watering, or rainfall. To control diseases with contact fungicides, there must be uniform coverage of the turf foliage. Refer to the product label for spray volume and surfactant recommendations. Systemic fungicides are taken up by plant tissues and distributed throughout the plant. These fungicides also act as contact fungicides on plant surfaces.
Fungal growth stops when plant-pathogenic fungi enter plant tissues containing systemic fungicides.
Uniform coverage of the turf foliage is critical for effective disease control with systemic fungicides. Refer to the product label for spray volume and surfactant recommendations. Fungicide Resistance Pesticide resistance should be a concern of turf managers who routinely use fungicides on leisure, commercial, or production turfs. However, fungicide resistance is very unusual, and its occurrence has not yet been recorded on turf in Alabama. Metalaxyl resistance in Pythium blight fungi has been reported on several golf courses in the Northeast.