Originally Posted by Poke 'Em
Phosphorus may make it bloom, but that doesn't answer the question of how it gets there in the first place. If it never makes it there, you don't have to worry about it blooming.
You read my post wrong, phosphorus does NOT make dydimo bloom, it stops it from blooming.
The point being made is that dydimo is already endemic and pervasive in North America. Dydimo has already spread and banning felt is not a solution to preventing further spread. The cows are already out of the barn!
What is causing the spread, I surmise, is the current trend of reducing phosphorus in detergents and lawn fertilizer. So as we get rid of phosphorus to prevent algae blooms we get dydimo blooms.
Ever wonder why NZ has such a problem with dydimo? They have lots of crystal clear streams and rivers with low phosphorus because there is little run off from agriculture and lawns.
Basic epidemiology 101 states that we cannot stop the spread of what has already spread. How we then prevent disease is to make the target population less receptive to the disease. We monitor phosphorus and allow some phosphorus back into lawn fertilizers in dydimo prone watersheds.