There is no set time restriction between seeding and applying Chlorothalonil DF Fungicide, though you shouldavoid watering at least 24 hours after application.
Quali - Pro Chlorothalonil DF Fungicide is best used as a preventative before disease is present but only to non-residential turf grass. We recommend using a product that is labeled for red thread such as Heritage DF 50, Honor Guard PPZ, Armada 50 WP, Fertilome Liquid Systemic Fungicide or Eagle 20 EW. We recommend that you read the product labels available for each of the individual products listed in this answer to see which product will best fit your needs. The product labels are available on each individual product page which you can find by clicking on the links provided above.
We would recommend contacting your local cooperative extension office and speaking directly to the master gardener on staff. Master gardeners are experts on the plants and plant diseases in their local region and they should be able to tell you exactly when you should perform the application.
