Chemical Control

HINT:  Clicking on any map displayed on this page will open a higher resolution PDF version, which can then be zoomed, printed, or downloaded. PDF map files posted to this website are designed to reveal excellent detail when zoomed to 400%.

Our leafy spurge biological control data are now displayed in our new Interactive Map application, or can be downloaded HERE



Although conventional herbicide treatment of upland leafy spurge infestations has been the norm in the Yampa River Basin, the use of biological control agents also dates back to at least 1989. Unfortunately, in the early years recordkeeping was sometimes incomplete, and (with the exception of Tepee Draw) virtually no follow-up monitoring was ever conducted. In the absence of such data, the relative success or failure of these “legacy” biological control releases was never substantiated.

Leafy spurge biocontrol agents photographed locally

Left top and bottom: Leafy Spurge Flea Beetles (black and brown species)

Right top: Leafy Spurge Hawk Moth Caterpillar

Right bottom: Leafy Spurge Stem-Boring Beetle