Pond Boss Forums Thread Like Summary - Is this fanwort?

This is growing profusely amongst mats of curlyleaf pondweed. I assume it is fanwort. I applied 10 ppb of fluridone a week ago for the curlyleaf pondweed. Will that control the fanwort also?

At your 10ppb concentration you could see some fanwort control. If it were my pond based the journal article I would treat again as another 10ppb or add a second treatment of 20ppb. Another option is to add a 2nd 10 ppb and watch the results. The 2nd fluridone 10ppb bump, if not a long delay from the 1st dose, may be enough accumulative effect to significantly reduce fanwort? Long delay = >2weeks and by then some of the first 10ppb will have dissipated. . Then if there is poor Fanwort control this year, next year treat real early as soon as new growth is seen with 20-25ppb. Treating very early in the growth phase works best for control of fanwort.
Report your results for all to learn.

Reference -
https://apms.org/wp-content/uploads/japm-40-02-058.pdf
In conclusion, the data from these studies showed that under these experimental conditions, the dose of fluridone required to substantially reduce fanwort growth (20 µg L-1 reduced biomass >80%), also severely impacted water marigold growth. (1ug/L = 1ppb).

It appears to be.

https://aquaplant.tamu.edu/plant-identification/alphabetical-index/fanwort/

No idea, but good pictures!