Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Duckweed

[quote=Jeffrey D.]Just an update on my duckweed.

I used the weedtrine-D(diquat), at about 1/2 the rate recommended, and it did kill my duckweed, or it's only a coincidence, and the duckweed was dying anyways?

I still have some floating, but most(maybe 75-80%) has gone, and what is still floating is gold coloured instead of green, now. I'm assuming that means it's dead?

I will spray it right away, again, if I see any green duckweed pop up.

So, as far as I can judge, the Weedtrine-D did work.

I also used it to kill the cattails directly around my dock.


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I think that is the way to do it. Always try that first spray at very low %. You can see if it has success, and if so continue and respray at very low concentrations. Yes, the yellow stuff is indeed dying and dead. Duckweed does not go yellow this time of year. And Weedtrine D is the lower of the diquats compared to Reward.

Bear in mind Todd the success he achieves with duckweed may or may not translate to watermeal.

I might have just done 1/2 or less of the material. Nobody wants a crash. And that stuff works so fast it can happen. Plus Diquot should not harm too many pond critters. I would wait a bit to let the dead material seperate from the live, it should on its own especially with some surface action in a good wind. Then finish off the rest on the surface. Eventually more will pop to the surface from the bottom, nail that as soon as it emerges. Great job!