barley straw didn't work for blanket weed in my pond but then Anthony told me :facepalm: when I said that it was in the sun almost all day.
It reduces over winter usually and I pluck it out every few weeks so it doesn't get out of hand. I didn't use barley straw extract as I was worried it would kill the bugs in my pond, as bug growing is the purpose of it's existence.
Will be interested to read the article.