2009 Annual Report 1a.Objectives (from AD-416) Identify repellents or attractants that could be used to manage the Asian citrus psyllid. 1b.Approach (from AD-416) Cooperator will provide ARS with various guava essence fractions, which ARS will screen for repellency or attractancy to the psyllid using olfactometer and EAD/EAG studies. Cooperator will further fractionate active fractions, and ARS will screen these as well. The chemical nature of any repellents or attractants found will be determined, if possible. 3.Progress Report This project is related to Objective 3c: Investigate basic biology and ecology of the Asian citrus psyllid and its natural enemies in Florida citrus. Research commenced on evaluating psyllid responses to a mix of guava volatiles. The objective of the project is to find a volatile that is either attractive or repellent to the psyllid. Initial screening indicated there is an attractant in the guava mix and that male psyllids are more strongly attracted to the volatile than females. Givaudan has been apprised of this and is sending fractions of the guava mix for further evaluations. Progress was monitored through email and telephone discussions of project plans.