I have a water garden in my yard. In the last couple of months the water lilies leaves are curving in a bowl shape. I have noticed worms about 1 inch long, yellow, with a black head have invaded the pond, and the water lilies. This is a large pond (cement), and can't be drained! What are these things and how do I get them out of the pond? The pond has gold fish and minows in it. Please E-Mail me at PostmanSeb@aol.com. Thanks for your help.
After searching around a bit I came up with the water lily beetle or the China mark moth. Both have larvae that can be distructive to water lilies. I couldn't find a of information on either one of them but here are a few links
PostmanSeb have you found out any more about these? Have you tried mosquito dunks? They're safe for the plants and fish and contain BT which kills the mosquito larvae. Maybe it would work on these larvae too.
Hey poppysue; I cut off all the leaves that were infested with the China mark moth larvae. I read they only invade the plants a few times a year. I think I have the problem under control now. Our county extension service were no help at all. He never heard of this problem before, in our area. I have had this pond for 10 yrs and never had this problem and hope its another 10 before I have it again. The lilies were blooming so good this year too. Oh well, with all this heat we are having they should come back in no time. Thanks again, Bruce