California Department of Fish and Wildlife
Hawk Study

Solving Pesticide Problems in California

Over the last four decades, CDFW has been involved in many monitoring studies of pesticides in the environment. These studies typically are designed with the objective of describing and solving a pesticide exposure problem. One example of this is monitoring rice pesticides in the Sacramento River which led to losses of tens of thousands of fish in the 1980s. In the 1990s, CDFW and UC Davis investigated the loss of raptors in orchards caused by the use of organophosphate insecticide dormant sprays. In the 1990s, CDFW monitored the effectiveness of legislation restricting the use of tributyltin antifouling paints in San Diego and Lake Tahoe. CDFW has also completed assessments of hazards posed by a number of pesticides to aquatic organisms in California.