Interesting that George Domb never respond and has never posted again, Hmmm, perhaps the Hyacyinth ate him.

As I said in my previous post, Water Hyacyinth in lower elevations is BAD BAD stuff. Unfortunately Joe it sounds like you have found that out already. You probably will have to resort to chemical treatment. I know Reward is listed as being effective against Hyacyinth. Perhaps one of the folks that specialize in pond chemicals can better address this question.

Can you prevent the cows from accessing the pond for several days if you treat it Joe?

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)