Which agency was designated as Florida's lead agency in aquatic plant control in 1970?

The Florida Department of Natural Resources was designated as the lead agency in aquatic plant control in 1970 due to its mandate to manage the state's natural resources, including water bodies and the ecosystems within them. This designation allowed the department to coordinate efforts in controlling aquatic vegetation, which is critical for maintaining ecological balance and protecting water quality. The agency was tasked with developing strategies for managing invasive species and promoting the health of Florida’s aquatic environments.

The other agencies, while also involved in various aspects of environmental protection and resource management, did not have the specific mandate for aquatic plant control at that time. The Fish and Wildlife Conservation Commission primarily focuses on wildlife management, the Department of Environmental Protection emphasizes broader environmental regulations, and the United States Army Corps of Engineers manages water resources with a focus on flood control and navigation rather than direct vegetation control in aquatic systems. Thus, the Department of Natural Resources' unique role made it the appropriate lead agency for this task.