2009 Annual Report 1a.Objectives (from AD-416) Evaluate efficacy, applicability and utility of Hydrellia spp as a biological control agent for management of Egeria densa. 1b.Approach (from AD-416) Efficacy and host specificity will be determined using standard, accepted methods for assessing feeding (with and without alternative host plants) and reproductive behavior both in the country of origin (Argentina) and under certified quarantine glasshouse and growth chamber conditions at Albany, CA. Range of water depths of feeding impacts will be determined using field sampling and multi-depth culture systems in Argentina. Developmental timing and temperature required for growth, reproduction and dispersal will be assessed to compare with conditions in proposed release site (Sacramento-San Joaquin Delta). Documents Reimbursable with California Department of Boating & Waterways. Log 39270. 3.Progress Report Plans were developed for foreign collections of insects in Argentina that are potential biological control agents for Egeria densa. Quarantine culture facilities are being made available in Albany, CA for the eventual transfer of insects upon appropriate approvals. Funding is not available and probably won't be for another month.