08/19/2026
Across California orchard systems, especially nut orchards in the southern San Joaquin Valley, roof rat pressure has grown significantly in recent years. These long‑established invasive pests are causing more damage than ever, creating real economic and operational challenges for producers.
To support growers, CDFA’s Vertebrate Pest Control Research Program partnered with Dr. Roger Baldwin, Professor of Cooperative Extension at UC Davis, to develop a 20‑video YouTube course focused on practical, science‑based strategies for managing roof rats in orchard environments.
The course covers:
• Monitoring strategies
• Habitat modification
• Biological control
• Trapping
• Baiting
• Burrow fumigation
Produced in collaboration with UC Agriculture and Natural Resources (UC ANR) and CDFA, this series blends applied research, regulatory awareness, and real‑world field experience.
Designed for growers, PCAs, and agricultural professionals, the course highlights integrated management approaches to help protect orchard productivity and support long‑term sustainability.
https://www.cdfa.ca.gov/plant/ipc/vertebrates/rat_management_resources.html
📸 The image shown highlights visible roof rat damage growers are increasingly encountering in their orchards.