crabgrass elimination after broadleaf sprayed
I have 2 acres lawn. I moved in May and was unable to apply a pre- emergent in April. I searched for a combination broadleaf -crabgrass post emergent but the shelves were bare. So I applied Trimec 899 four days ago to eliminate broadleaf weeds. My question is can I now follow up with a post emergent crabgrass killer ( ortho weed be gone - crabgrass killer -methanaersonate) without overstressing and damaging the existing turf. Mainly mixed cool season grasses fescue and some bluegrass.
The weather has been cool and wet. max temp 75.
I want to overseed in the beginning- mid. sept.. ( 3-4 wks after the trimec application)
My first post and next year I plan on a pre- emergent in April but for now the crabgrass is going strong and I think it would interfere with my overseeding efforts next month.
Thanks for any help on this.