2007 Annual Report 1a.Objectives (from AD-416) Characterize role of volatile attractants mediating mate location behavior in pear psylla, and identify those attractants. 1b.Approach (from AD-416) Behavioral assays will be done to ascertain conditions leading to optimal female attractiveness to male pear psylla. The assays will be followed by standard methods in pheromone chemistry to isolate, identify, and synthesize the attractants responsible for mediating male response. Documents Assistance-type Grant with UC Riverside. 3.Progress Report This report serves to document research conducted under a Grant agreement between ARS and University of California, Riverside. Additional details of research can be found in the report of the parent project 5352-22000-017-00D 'Management of Insect Pests of Temperate Tree Fruit Crops'. A series of behavioral studies were done to assess response by male pear psylla to volatile chemicals associated with females. Assays showed that males are attracted to odors from female psylla. Diapause status and age of females affected male response, whereas mating status and presence of host plant did not. Results suggest that females of this pest species emit a sex pheromone. ADODR STATEMENT: Monitoring of activities and progress on this project was accomplished by direct supervision of on site employees, and use of e-mail and telephone to communicate with off site collaborators.