If its potted and you can lift it out without polluting the water with mud AND if you are allowed to hose, just blast them off with a hose and repeat as necesary. Or water blast anyway and hopefully your fish (if you have fish) may clean them up. If you have frogs or fish then you probably don't want to use chemicals, I would wait for the experts to come on board here with some possible friendly remedies
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.
alisonoz_gw
sterculias
Related Discussions
water lettuce has bugs
Q
First Year with 6 x 8 HFGH
Q
Hey All!! I'm baaaaaack...
Q
Ants!
Q