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Commissioners weigh timing and drift as reasons for variable treatment outcomes
Summary
Speakers suggested earlier-season application could reduce fragment survival and biomass-related algae issues; presenters also pointed to flow-driven drift that likely moved product clockwise and left a narrow untreated northern edge where milfoil persisted.
Discussion at the meeting highlighted two management questions: whether treatment should be scheduled earlier in the season and how flow/drift affected product contact. Bob Bombard said treating earlier would likely reduce biomass and fragment survival, noting "If you've done this 1 month earlier... I think results would have been different." The presenters pointed to GPS tracking and mapped treatment lines showing a yellow band on the north edge where contact likely was lower due to flow patterns.
Commissioners asked for follow-up testing of an earlier-application timing and more detailed drift analysis; staff responded that permit limits and applicator logs would be reviewed and that further monitoring would aim to separate true survivors from fragments that drifted into bays. No formal change in scheduling or permit request was made at the meeting; staff committed to supplying final maps and the applicator's GPS track for commissioner review.
