A new study published in Environmental Toxicology and Chemistry found nearly ubiquitous pesticide contamination on butterfly host plants across two U.S. cities, Albuquerque, New Mexico, and Sacramento, California. In 20% of the plants tested, pesticide residues were at levels known to kill or otherwise harm butterflies and moths.
Pesticides
How Urban Pesticides Can Harm Monarch Butterflies: A Cautionary Tale from California
In January 2024, volunteers stumbled upon a devastating scene: scores of dead and dying monarch butterflies near the Pacific Grove Monarch Sanctuary overwintering grove.