Focusing on solutions for growers for Invasive Species Awareness Week, February 23-27
Orchard systems across California—particularly nut orchards in the southern San Joaquin Valley—have seen a significant rise in roof rat activity in recent years. While roof rats are a long-established invasive species in the state, both their populations and the extent of damage they cause have increased substantially, creating growing economic and operational challenges for producers.
To address this issue, staff with CDFA’s Vertebrate Pest Control Research Program have worked with Roger Baldwin, Professor of Cooperative Extension at University of California, Davis, to develop a comprehensive, 20-video YouTube course. Baldwin specializes in human–wildlife conflict, with an emphasis on rodent management in agricultural and natural resource systems. Drawing on applied research and field experience, the course provides practical, science-based strategies designed specifically for orchard environments.
The videos cover specific topics organized by sections: monitoring strategies habitat modification, biological control, trapping, baiting, and burrow fumigation. The series was produced in collaboration with UC Agriculture and Natural Resources (UC ANR) and the California Department of Food and Agriculture, reinforcing its foundation in research, regulatory awareness, and real-world agricultural application.
Designed for growers, pest control advisors, and agricultural professionals, the course outlines integrated management approaches to help mitigate roof rat damage, protect orchard productivity, and support long-term sustainability. By combining monitoring, habitat modification, and targeted control strategies, the program equips stakeholders with the tools needed to respond effectively to escalating roof rat pressure in California orchard systems.
This resource reflects a coordinated effort between university research, state agriculture leadership, and field-based expertise to support California producers facing increasing rodent challenges.
To view the Rat Management Training videos, visit CDFA’s YouTube page, where you can select topics to meet your agricultural needs.
