The first release of an approved biological control for swallow-wort has occurred in the SLELO PRISM Region. Hypena opulenta, a moth native to the Ukraine, that feeds exclusively on swallow-wort was released at two locations. Researchers from USDA APHIS recently joined with SLELO partners to release 825 hypena larvae (3rd, 4th and 5th instar) into experimental cages along Eastern Lake Ontario. It is believed that it may take several years for populations of the moths to become sufficient to noticeably suppress swallow-wort populations. SLELO partners will assist in the monitoring of these bugs for the next two years.