Wade from Dade City, Fl writes
I mixed as per label, using the included syringe, and used a surfactant. Spot applied to trouble areas of the lawn. Now you can see everywhere that I sprayed it. My St. Augustine is white. But the white grass keeps growing and needs to be mowed. It has now been 3 weeks since application. For obvious reasons, I did not make the second application.
Tenacity Herbicide does cause whitening of plants since its mode of action is to prohibit chlorophyll production in target plants. Many users have had whitening on the lawn after applications, but the grass usually does recover after 3-4 weeks. The product label specifies that Tenacity be used at lower rates for St. Augustinegrass, and only on established sod St. Augustine; St. Augustine lawns started from seed may have more sensitivity Tenacity. If the grass is still growing and needing to be mowed, then it will usually recover. You may want to wait several weeks to be sure future applications will not permanently damage your turf. Also, be careful so that your application is even and not overlapping, and that you are using a surfactant when making your application. You may also want to consider adding a turf marker such as Turf Mark Blue to prevent over-application.
Answer last updated on: 12/01/2015
