Empoasca sp. leafhoppers are resident of the plants in and around the pond, among them Pickerel weed (Pontederia cordata).

References
1 Nederlands SoortenregisterEmpoasca sp.
Pontederia cordata (Pickerel weed)Empoasca sp. leafhoppers are resident of the plants in and around the pond, among them Pickerel weed (Pontederia cordata).
References
1 Nederlands Soortenregister