John from Leesburg, Va writes
Tenacity Herbicide does cause whitening of plants since its mode of action is to prohibit chlorophyll production in target plants. According to the product label, this product may cause temporary whitening of turfgrass foliage. In general, symptoms appear five to seven days after application and last for several weeks. Grass usually recovers after 3-4 weeks.
Answer last updated on: 04/19/2019