I agree with Mike but refer to FA growth as a sign of "Nutrient Pollution". The FA is growing as a natural response to high levels of nitrogen and phosphorus. What you have, though it's hard to tell how big your pond is, doesn't seem aesthetically displeasing or detrimental to your ponds aquatic health, it is actually helping.
Like Mike wrote, harvest the dead plants rather than letting them die and decompose in your water.
If you choose to treat it with a chemical, you still have to remove the dead plants.
