However, starting from the 1980s, a dramatic and largely unexplained decline in the population of the nine-spotted ladybug occurred. Multiple species of ladybugs faced similar fates during this time, but the disappearance of the nine-spotted ladybug has been particularly pronounced. Despite its once-ubiquitous presence, in the eastern parts of North America, this species has been absent for over a decade. The last confirmed sightings in this region date back many years, with no signs of recovery since then.

Scientists have been scrambling to understand the reasons behind this sudden and severe decline. Some theories suggest that competition with invasive ladybug species, such as the Asian multicolored lady beetle, could be a factor. These invaders might outcompete the native nine-spotted ladybug for food and resources. Habitat loss due to urban expansion and changes in agricultural practices, including increased pesticide use, could also be contributing to their decline. Additionally, climate change may be altering the environmental conditions that the nine-spotted ladybug depends on for survival and reproduction. As researchers continue to investigate, the case of the nine-spotted ladybug serves as a cautionary tale about the delicate balance of our ecosystems and the importance of protecting native species.