TRAVERSE CITY, Mich. (AP) — Toxic algae blooms on Lake Erie may form more often unless farms and cities do a better job of controlling runoff of nutrients that feed them, a scientist said Tuesday as specialists developed proposals for confronting the threat.

About 40 experts met for two days in Windsor, Ontario, to compare research findings about the lake’s struggles with algae and work on a report for government policymakers. The gathering was convened by the International Joint Commission, a U.S.-Canadian agency that advises both nations on issues affecting shared waterways.