At this point, a tip of the hat goes out to all those who have been part of the effort to address the discovery of Eurasian watermilfoil in the canals on West Okoboji. Yes, the battle continues in the fight against Eurasian watermilfoil continues. The latest effort took place on the canals of West Lake Okoboji on Tuesday, Sept. 19. In visiting with Mike Hawkins, fisheries biologist, treatment consisted of using a fast-acting herbicide called ProcellaCOR.