EVIARC was organized in 1991 through Administrative Order 6 and 19 which, mandated the implementation and operationalization of the Department of Agriculture's Stations' Rationalization Program (SRP). It created in every region a Regional Integrated Agricultural Research Center (RIARC). In Region 8, it established the EVIARC, which merged 15 stations and facilities into one RIARC and 6 major stations to compose the Research Outreach Stations (ROSes).

The then Abuyog Experiment Station, in Abuyog, Leyte was transformed into a nerve center for Research and Development activities of EVIARC with its 6 ROS. Each of the 6 ROSes represented a particular development focus, such as:

• ROS for Upland Farming Systems Development (ROS-UFSD) Brgy. Bagong Silang, Babatngon, Leyte
• ROS for Lowland Farming Systems Development (ROS-LFSD) Brgy. Irawan, Catubig, Northern Samar
• ROS for Postharvest Technology Development (ROS-PTD) Brgy. Sapinit, San Jorge, Samar
• ROS for Soils Technology Development (ROS-STD) Brgy. Naparaan, Salcedo, Eastern Samar
• ROS for Livestock Development (ROS-LD) Brgy. Sangahon, Malitbog, Southern Leyte
• ROS for Fisheries Development (ROS-FD) Brgy. Sto. Niño, Guiuan, Eastern Samar

Under these ROSes were the facilities that were retained and transformed to form part of the ROS.

In the early part of 1995, however, the department adopted a sectoral (crops, livestock and fisheries) orientation of agricultural program planning and implementation. With this, EVIARC realigned its ROSes and facilities and created three sub-networks, namely: (1) the Crops Sector, (2) the Livestock Sector, and (3) the Fisheries Sector. Each of these sub-networks is composed of ROSes and facilities to focus on a specific sector or commodity.