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Cameron writes

If Trimec Broadleaf herbicide has been applied 10 days ago, when can I apply Tenacity Herbicide as a post emergent for crabgrass control in a Tall Fescue lawn?


If not applied around the same time you should wait 1 week to apply another herbicide. Tenacity Herbicide when mixed with a non ionic surfactant will control crabgrass up to the 4 tiller leaf state only and is best applied when it just emerges.  Drive XLR8 is actually the top product for crabgrass and can kill it best when it just emerges or after it has fully matured just not as good during the 2-4 tiller (middle) state. A methylated seed oil surfactant is also recommended for best results with Drive XLR8. Which you use can depend on the tiller stage of the crabgrass but Drive is usually the go to for post emergent control of crabgrass. 

Answer last updated on: 04/30/2021

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