Yes, Monument 75WG Herbicide can be applied to established Bermuda for treating poa annua.
Monument in the small packets was discontinued. The same product is now available only in the larger box of 5 x 5 g packs here. Please let us know the plants you are targeting along with your desirable turfgrass and how large of an area treating if you would like us to recommend an alternate product.
We do still offer Monument 75WG Herbicide just in a different quantity.
Monument 75 WG has multiple ranges of mix rates on the product labe based on the turf type you are spraying over and the target weeds. You would use anywhere between 2-3 packets on average per acre based on the weeds you need to eliminate. On average you should use at least 50 gallons of water per acre when doing an application which is at least 1 gallon of water per 1000 sq/ft.
Monument 75WG Herbicide does list torpedograss on the label as suppressed, this means that it can take more than one application to get control of.