Several species in the genus Myriophyllum (milfoils) occupy Maine waters. Many of these species are native to our waters; whereas others are foreign invaders which threaten to upend the balance of our treasured aquatic communities. A herculean effort through the collaboration of citizen scientists, volunteers, not-for-profit organizations, professional scientists, and educators have managed the spread of invasive milfoils in Maine for decades. Bernacki will describe a new strategy being used to manage milfoil populations in Maine: genetic analysis. Using genetic assays, he and his collaborators have been able to add precision to management practices. He will describe three separate but related genetic projects which have augmented, or have the potential to augment, the management of invasive milfoils in Maine and beyond.