Prime Source AzProp Select Fungicide should be applied with a sufficient water volume for adequate coverage at the time of application and wait 24 hours if your lawn requires irrigation. The only time you irrigate after application is if treating for fairy ring per the product label.
The coverage rate of Prime Source AzProp Select Fungicide will vary depending on what you are treating for abd ib. Please see the mixing rates starting on page 7 of the label.
It is not recommended apply Prime Source AzProp Select Fungicide with a hose end applicator as they do not deliver an even application and most do not go down to a low enough setting for proper dilution. It is best to use a hand-pump or backpack sprayer to ensure the most accurate application.
Please view the product label for the recommended application rate for the lawn disease you are targeting.