** AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** SPOTTED WING DROSOPHILA (SWD), DROSOPHILA SUZUKII, HAS BEEN AN IMPORTANT PEST OF CHERRY AND BERRY CROPS IN THE CONTINENTAL UNITED STATES SINCE ITS DETECTION IN 2009. THESE HIGH-VALUE SPECIALTY CROPS CONTRIBUTE SUBSTANTIALLY TO WASHINGTON STATE'S AGRICULTURAL PRODUCTION VALUE, WHICH LEADS THE NATION IN BOTH SWEET CHERRY AND BLUEBERRY PRODUCTION. SWEET CHERRIES OCCUPY 39,000 ACRES, WITH A VALUE OF $12,360/ACRE, WHILE BLUEBERRIES OCCUPY 20,200 ACRES WITH A VALUE OF $11,328/ACRE. THE LARVAE OF SWD FEED INTERNALLY, AND ONCE THEY HAVE ENTERED AND START FEEDING INSIDE FRUIT, THEY ARE DIFFICULT, IF NOT IMPOSSIBLE TO KILL WITH PESTICIDES. INFESTED FRUIT MUST BE DESTROYED, AND IN SEVERE CASES, IT IS NO LONGER PROFITABLE TO HARVEST THE CROP, LEADING TO 100% FRUIT LOSS. A ZERO-TOLERANCE POLICY FOR LARVAE IN FRUIT IN BOTH DOMESTIC AND EXPORT MARKETS HAS LED TO THE WIDESPREAD ADOPTION OF WEEKLY INSECTICIDE SPRAYS. THESE CALENDAR-BASED SPRAYS ARE APPLIED EVEN IN YEARS OR REGIONS THAT HAVE LOW SWD PRESSURE, LEADING TO THE POTENTIAL FOR UNSUSTAINABLE ECONOMIC COSTS AND POTENTIAL INSECTICIDE RESISTANCE. DESPITE THE HOT DRY MICROCLIMATE OF CENTRAL AND EASTERN WASHINGTON, SWD HAS ESTABLISHED IN CHERRY ORCHARDS AND BLUEBERRY FARMS, PRESUMABLY SURVIVING BY MOVING BETWEEN IRRIGATED CROPPING SYSTEMS. THIS CREATES AN IDEAL OPPORTUNITY TO BETTER UNDERSTAND THE MOVEMENT OF THIS INVASIVE PEST.TO ADDRESS THESE GAPS IN OUR UNDERSTANDING OF SWD OUTBREAKS IN CHERRY AND BLUEBERRY, I PLAN TO DEVELOP A SERIES OF ECOLOGICAL MODELS THAT WILL ESTIMATE THE RELATIVE EFFECT OF EXTREME WEATHER EVENTS, CROP PHENOLOGY, PROXIMITY TO ALTERNATIVE TREE FRUIT CROPS, AND INTERCROP MOVEMENT ON SWD DYNAMICS. I PLAN TO ADAPT A PRE-EXISTING SWD TRAPPING NETWORK AND EXPAND TO ADDITIONAL ORCHARDS COVERING A LARGER AREA OF THE WASHINGTON CHERRY AND BLUEBERRY GROWING REGIONS. THE DISTRIBUTION OF THESE TRAPS WILL PROVIDE US WITH THE ABILITY TO ASSESS POTENTIAL DIFFERENCES IN SWD ABUNDANCE DUE TO VARIABLE MICROCLIMATES, LANDSCAPE FEATURES, OR GROWER PRACTICES. BASED OFF HISTORIC AND CURRENT SWD MONITORING DATA, I WILL PRODUCE A SERIES OF MODELS TO ASSESS THE POTENTIAL IMPACT OF EXTREME WEATHER EVENTS. THE PAIRING OF FRUIT SAMPLING WITH SWD MONITORING WILL ASSESS THE POTENTIAL FOR NEIGHBORING CROPS OR UNHARVESTED BLOCKS TO SERVE AS RESERVOIRS FOR SWD. FIELD SURVEYS OF SWD ALONG CHERRY ORCHARD EDGES AND ADJACENT CROPS WILL ALLOW FOR ASSESSMENTS OF SEASONAL SWD DYNAMICS. THESE OBJECTIVES WILL BUILD THE FOUNDATION FOR SUSTAINABLE SWD MANAGEMENT PROGRAMS AND PROVIDE A FRAMEWORK FOR THE MANAGEMENT OF OTHER TREE FRUIT PESTS IN IRRIGATED LANDSCAPES. BY UNDERSTANDING ENVIRONMENTAL AND CROP EFFECTS ON SWD DYNAMICS, WE CAN HELP CHERRY AND BERRY GROWERS WITH IMPROVE THE TIMING OF PESTICIDE SPRAYS AND REDUCE THE NUMBER OF SPRAYS. THESE IMPROVEMENTS IN MANAGEMENT WOULD IDEALLY LEAD TO REDUCED CROP DAMAGE AND IMPROVED PROFITS FOR GROWERS. THE ECOLOGICAL MODELS AND EXTENSION TOOLS GENERATED BY THIS PROJECT WILL NOT O,NLY BENEFIT CHERRY AND BERRY GROWERS IN WASHINGTON STATE BUT ALSO AID GROWERS ACROSS THE NATION IN IMPROVING SWD MANAGEMENT.