If you are planting grass seeds that have not been treated with fungicides, you should treat the soil at the time of seeding or soon thereafter. Follow the manufacturer's instructions for the timing and rate of application of the fungicide.
About this Author
Melody Lee worked as a newspaper reporter, copywriter and editor for 5 years. In addition, she has edited magazine articles and books. Lee holds a degree in landscape design and is a Florida master gardener. She has more than 25 years of gardening experience, which includes working at nurseries and greenhouses.