View Full Version : Fungicide and watering

09-02-2005, 07:08 PM
If a fungicide is granular and needs watering to "activate", would it make more sense to water at night since a wet lawn at night favors fungal activity?

The logic I am using is similar to weed control strategy. Apply when "target pest" is actively growing.

Any thoughts would be helpful.


Neal Wolbert
09-02-2005, 10:53 PM
It depends. Are you treating pre or post infection? Most fungicides are effective for a number of days against disease, some as high as 28. So if there is no disease symptoms yet, treat to prevent infection prior to suspected infection times. If disease is present, treat asap and the label will guide you as far as followup treatment dates are concerned. Neal

09-03-2005, 11:22 AM
No don't water at night / evening if the weather is favorable for disease. You will only make the problem worse.

Most granular fungicides are systemic. They need to be watered in, then are absorbed by the plant and trans-located throughout the plant to protect it. Granular systemics work much better when applied prior to disease development. These products typically take several days to get absorbed into the plant and up and running.

When disease is present a sprayed on contact fungicide will work much quicker, although not everyone is able to do this.