| The experts are a worry Alison. I have a problem with the moth larvae eating my water lilies and I have been told all sorts of things to use and been assured it won't harm the fish. Here are some of the products recommended but no way would I use them. Rogor
Diazinon
White oil. Anne,
Check with your local aquatic plant nursery for help but give the pet shops a miss. If your plant is potted you may be able to remove it to another container and treat the aphids until they are gone then clean any residual chemicals off and then replace it back in its pride of place. I would be careful about water blasting the aphids as water lilies are subject to bruising. This will kill the affected stems so handle with care. If you don't have fish it may not be a problem. Doug.
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