Daylillies are labeled as tolerant to Certainty Herbicide application. That being said, it would be best to directly spot treat the nutsedge and take care to avoid spraying the daylilies or allowing drift to contact them.
While Certainty and Prodiamine can be mixed together with no issue, Prodiamin is only going to prevent spring germinating weeds from coming up and only if you are getting it down prior to soil temperatures reaching 50-55 degrees as that is when seeds germinate. Also, poa annua is a fall germinating weed so a spring application will not prevent anymore of it coming up. You would need to use something like the Prodiamine in the fall around Sept-Oct 15th to effectively prevent it the next year.
The 1.25 oz bottle of Certainty Herbicide will treat from 10,000 to over 35,000 sq. ft. (depending on the weed and grass).
According to the product label, you should wait at least 3 weeks before re-seeding or over-seeding after using Certainty Herbicide.
Certainty Herbicide - 1.25 oz. cannot be used in cool season grasses and will harm them. We are not aware of any product labeled to control poa trivialis in a bluegrass lawn. In your case it would be best to spot treat the poa with a glyphosate based product such as GlyPhoSel Pro and reseed the area.
The manufacturer date to the Certainty Herbicide 1.25oz is located inside the box, on the bottom of the bottle.
Certainty Herbicide - 1.25 oz. would be good for spurweed aka burweed.
The Certainty Herbicide label states the best results are obtained when target weeds are actively growing and not disturbed by mowing for at least 2 days before and 2 days after an application.
Yes, Certainty Herbicide can safely be used on Bermuda grass.