I'm going to hijack this thread to get a little more info. I've ordered a Chapin 20v backpack sprayer and have some Talstar P and Prodiamine 65WDG coming tomorrow. However, as I haven't applied the Pre-e in time, I have some weeds already showing. From other threads it seems a popular post-e is Certainty.
My question is this: as Certainty comes in small volume (1.25oz.), how far does that go? It seems the Prodiamine will last forever, but the Certainty will be gone and at roughly $90 a pop thats no fun. Do you just put a small scoop into a gallon and then just spot treat, that gallon getting the entire yards spots?
EDIT: and another noob question: Do you guys color mark your spray every time you do the whole lawn? How long is the lawn discolored or do you wash it away when watering in the treatment? (if you water in the treatment) Which color marker do you use?
Most don't broadcast spray Certainty, they use it primarily for sedges and just spot spray them.
For broadcast post emergence Celsius is your best, safest and cheapest route. It's not cheap up front (around $100) but when breaking it down per application it's cheapest. Plus it has no temperature restrictions like a 2, 4D product.
I use a blue marking due when I broadcast spray but not when spot spraying. When spot spraying I normally just walk straight lines across the lawn and get anything I can reach. Then move over 4-5' and walk back the other direction. I can usually tell what weeds have already been sprayed as they will still look a little wet.
Most herbicides recommend around 24 hours before any rainfall or irrigation. The marking dye I use washes off easily with the sprinklers.