**AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** NATIVE POLLINATORS NEED HEALTHY ECOSYSTEMS, BUT POLLINATOR HABITATS IN AGRICULTURAL AREAS CAN BE IMPACTED BY PESTICIDES USED IN NEIGHBORING FARM FIELDS. WHILE INSECTICIDES CAN DIRECTLY AFFECT POLLINATOR HEALTH, CHEMICALS LIKE FUNGICIDES CAN INDIRECTLY IMPACT POLLINATORS BY ACTING ON THE MICROBES AND PLANTS ON WHICH POLLINATORS DEPEND. THE PRESENCE OF THESE PESTICIDES COULD ALSO ALTER POLLINATOR BEHAVIOR IN WAYS THAT CHANGE THEIR EXPOSURE TO POTENTIALLY HARMFUL CHEMICALS. IN THIS COLLABORATIVE PROJECT, WE FOCUS ON THESE INDIRECT EFFECTS, WHICH CAN LEAD TO ECOLOGICAL SURPRISES IN POLLINATOR CONSERVATION. OUR TEAM HAS PRELIMINARY DATA FROM A POLLINATOR HABITAT RESTORATION EXPERIMENT, WHERE WE FIND THAT REGULAR EXPOSURE OF PLANTS AND SOILS TO INSECTICIDE AND FUNGICIDE TREATMENT CHANGES MICROBIAL FUNCTION IN THE SOIL AND ALTERS THE AVAILABILITY OF FLORAL RESOURCES TO FORAGING BEES. IN THIS COLLABORATIVE PROJECT, WE WILL BUILD ON THIS EXPERIMENT IN ORDER TO ACCOMPLISH TWO OVERARCHING RESEARCH OBJECTIVES: 1) DETERMINE HOW PESTICIDE-ALTERED SOIL AND PLANT MICROBIOMES AFFECT POLLINATOR AND PLANT HEALTH; AND 2) INVESTIGATE HOW PESTICIDES AFFECT NESTING AND FORAGING DECISIONS OF NATIVE BEES. WE WILL ALSO IDENTIFY KEY MICROBIAL AGENTS OF POLLINATOR HEALTH. THIS PROJECT ADDRESSES TWO PRIORITY AREAS OF THE POLLINATOR HEALTH PROGRAM: FACTORS THAT INFLUENCE THE ABUNDANCE, DIVERSITY, AND HEALTH OF POLLINATORS; AND FUNCTIONS OF THE MICROBIOME ASSOCIATED WITH POLLINATORS AND THEIR ROLE IN PROMOTING HEALTHY POPULATIONS.