Although scientists have made headway in developing biological methods of controlling agricultural pests, the equipment used to apply traditional chemical pesticides may not be suitable for the new "biorational agents," according to William E. Steinke, a Cooperative Extension agricultural engineer at UC Davis. Steinke will assess existing practices for application of biorational agents such as bacteria, viruses, fungi, pheromones, predators and parasites at 9:30 a.m. Wednesday, March 16, in the Marriott Hotel during a session on biorational pest-control agents. He also will address the future needs for handling, metering, dispersal and collection of these materials.