D. from Wentzville, Mo writes
I realize 55 degrees is optimal temperature for application of Tenacity. Currently air temperature is in 30-45 range however, forecasts are calling for a 2 week period of temps over 55 degrees. Would Tenacity kill broadleaf weeds during that two week window? I'm not concerned about crabgrass since it dies off with first hard frost.
Pre-emergents such as Tenacity Herbicide can be applied both in the spring & fall. They are applied once soil temperatures reach below 70 degrees, which are different from the air temperatures. Most of the US has already reached the point where they can go ahead & apply pre-emergents. Even though Tenacity can work as both a pre & a post, due to soil temperatures it will only work as a pre-emergent. Meaning it will only prevent germination not kill what's already germinated.
Answer last updated on: 10/31/2023
