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Overseeding and tenacity

3.5K views 2 replies 2 participants last post by  ionicatoms  
#1 ·
Hi,

I am new here and new to lawn care, but I am bringing up to speed myself with lots of reading in this forum (man those LOTM pics are amazing, and shout out to the admins for doing that as a requirement to open the new account) and watching youtube.

I am planning to rent a mantis tiller to do the dethatch and aerate (I have bought the corresponding attachments) on Saturday (in 3 days). Then overseed. Some area of lawn gets full sun but some get partial sun due to some trees. So the seed mix I am planning to use is from Lesco:


Metro mix has 50% Turf-type perennial Ryegrass, 20% Kentucky Bluegrass, 15% creeping red fescue, 15% Chewings fescue.
Sun and Shade park has34% Turf - Type Perennial Ryegrass, 33% Fine Fescues, 33% Shamrock KBG.

Before I do my overseeding, I'd like to "spot" treat with tenacity. I says "spot" in quotes because there are some areas of my lawn that is full of nimblewill. The largest area that they are taking over is about about 100-150 sqft. Please see the attached photo which is just a partial of pic of that problematic area. Personally, that area looks bigger than a spot.

My questions are:

1. What rate should I use for tenacity? The label says that for spot treatment, use 0.5 tsp mixed with 1 gal of water per 1000 sq ft. For regular treatment (I am assuming blanket spray), it says to use 4-8 oz/acre. Based on my turf I have (mix of ***, Ryegrass, Fescue), I need to stay below 5 oz/acre rate. In July, I did a blanket spray using the spot treatment rate (0.5 tsp/gallon)--a newbie mistake. But it did clear some of the clovers, but the nimblewill are coming back now.

2. Can I spray tenacity like 2 days before my overseeding? I read that tenacity can be used as pre/post-emergent and won't affect the existing grass, but will tenacity stop my newly put down grass seeds from sprouting?

3. Considering tenacity, which seed mix should I use? Are there some seeds that don't work well with tenacity? Or should I not do the tenacity at all because I am overseeding?

Any suggestions and pointers are greatly appreciated.

TIA!

 
#2 ·
In case some other folks are looking for the same information, I called the support line for Tenacity and got the answers:

1. spraying tenacity before/after/during overseeding is fine as long as the seeds mixture does not have more than 20% fine fescue and hard fescue. (So for me I have to pick the Metro mix instead of sun and shade mix).
2. He recommends that home owners use the spot treatment if possible (0.5 tsp/gallon).
3. For my nimblewill problem, he said the spot treatment should be fine.
4. Also he said mix only what you would absolutely need because once mixed you can't store it because the active ingredients start to break down after 8-10 hrs.