Here is a link to an information page from a large supplier.

2,4-D Herbicides

Under the product information sheet, that link shows lots of products that are NOT applicable.

I believe their Navigate granules may be applicable to your situation.

White and yellow water lily and water shield are on that label as targets for that formulation.


*** I am definitely NOT an expert, and I have not used herbicides in my ponds at our property (but I use them frequently on our terrestrial undesirable plants).

There are many experts on Pond Boss that deploy herbicides on ponds as professionals, or have been treating their own ponds for many years. Hopefully, some will comment in your thread.