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Pete from Wexford, Pa writes

Will Tenacity rid my lawn of bentgrass, or should I use Roundup QuikPro?

I used tenacity last Fall, but the creeping bentgrass is still there. After the third application (each application put down 2 weeks apart) I raked the 'brownish' bentrgrass and re-seeded (seed: Penn State mix) the areas where I applied Tenacity; but it didn't work since the bentgrass is still there. Maybe I should have not raked and just scratched the soil with a garden weasel and re-seeded? Maybe the raking didn't allow the Tenacity to stay in the bentgrass' root system?

Answer:

Tenacity Herbicide is our most popular product for eliminating bentgrass from other desirable turfgrasses, but it does typically require multiple applications. Late summer/Fall applications will be more effective than Spring applications. If you are able to spot treat with RoundUp QuikPro, that is another option. It would still be ideal to wait at least 10-14 days after applying the Roundup QuikPro before raking out the dead plants and re-seeding those areas.

Answer last updated on: 08/31/2017

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