The current leading biological control method of hemlock woolly adelgid is "Sasajiscymnus tsugae", called "Pseudoscymnus tsugae". "S. tsugae" is a black lady beetle that is relatively host-specific, feeding only on three known aldegid species, including HWA. This beetle was discovered in 1992 while feeding on hemlock woolly adelgid in its natural range of Japan. Since 1995, the DCNR's Bureau of Forestry has released hundreds of thousands of adult "S. tsugae" beetles into affected hemlock forests of the eastern United States to determine its effectiveness at controlling the spread of the adelgid. From 1995 to 1997, experiments in Connecticut and Virginia found that releasing adult "Sasajiscymnus tsugae" beetles into infested hemlock stands resulted in a 47 to 88% reduction in adelgid densities within 5 months of introduction. The beetle's lifecycle is in parallel to the lifecycle of the hemlock woolly adelgid. Both lay eggs in the spring and hatching occurs nearly simultaneously. When hatched, "S. tsugae" larvae are highly mobile and feed on hemlock woolly adelgid eggs and larvae. Each "S. tsugae" larva can effectively consume about 500 adelgid eggs or nearly 100 developing adelgid nymphs.