Tenacity Herbicide is not labeled to control poa annua/annual bluegrass as a post emergent application and will only suppress poa annua when used as a pre-emergent.
It is recommended that you do not mow 2 days before or 2 days after the application of Tenacity Herbicide.
You can reapply Tenacity Herbicide after 2-3 weeks for post emergence control of actively growing weeds for best results. There should not be an issue applying lime after the application. We would encourage you to get a soil test to determine the pH level of the soil you are treating also. This can be done at your local cooperative extension.
There is no specific time that you need to wait after using an herbicide like Tenacity before you can apply a fertilizer. As long as the turf is healthy and you are following the directions on the product labels for what you are applying, then you should not come across any problems. Please see our Lawn Care Schedule for additional tips.
Tenacity Herbicide can be used as a broadcast application for pre-emergent control of the listed weeds on the label. It can be used anytime of year depending on target weeds. As long as you keep pets/children out of the area while you treat and until the product has had time to completely dry or settle it is safe for pets and people to return and resume normal activity
Per the manufacturer, " Tenacity has been tested in tank mixtures with Barricade 65WG Herbicide (prodiamine), Vanquish® (dicamba), Turflon® ester (triclopyr), Spotlight™ (fluroxypyr), Quicksilver™ (carfentrazone), Basagran® (bentazon), Princep® (simazine), and AAtrex® (atrazine) for safety and efficacy on turfgrasses. Tenacity must be applied at reduced rates (4 fl. oz./A or less) if tank mixed with atrazine, bentazon or simazine. Other tank mixture partners may be safe but have not been tested. Turf managers wanting to tank mix Tenacity with other herbicides should test on a small basis for compatibility, safety and efficacy before treating large areas. See product labels for directions and precautions."
When using Tenacity, foliage of treated weeds cease growth after application, then turn white (loss of chlorophyll) and death may take up to three weeks. A repeat application may be required depending on what weeds you are treating.
It is not recommended to mix certain insecticides, herbicides, or fungicides with Tenacity Herbicide. You should wait to apply insecticides 7 days after treating with Tenacity Herbicide to avoid potential turf injury. Other ingredients in the fungicides or herbicides would be fine to use at the same time if there are no resttrictions on the product label.
The product label states that bermuda grass is sensitive to Tenacity but it would not be recommended as a product specifically used to kill it. Fusilade II can be used to get rid of bermuda grass in tall fescue. Please be advised that bermuda grass is extremely difficult to control and you will likely need to make several applications.
Yes, Tennacity be applied to dormant Bermuda grass.
Tenacity Herbicide can be applied any time before the weeds start to germinate. Weeds absorb Tenacity as they emerge from the soil. For the best time to apply pre-emergents in your county we recommend contacting your local cooperative extension office here. Crabgrass seeds will start to germinate when soil temperature are around 55 degrees, so you need to apply it before you have those temperatures for best results.
Tenacity Herbicide should be applied before soil temperatures reach 55 degrees if using as a pre-emergent. If as a post you would apply when the target weeds are actively growing and healthy.