METHYL BROMIDE (MEBR), AN EXTREMELY EFFECTIVE FUMIGANT FOR CONTROLLING SOILBORNE PATHOGENS AND WEEDS WHEN MIXED WITH CHLOROPICRIN, WAS PHASED OUT OF USE IN CA STRAWBERRY PRODUCTION IN 2016 UNDER THE MONTREAL PROTOCOL. IN RESPONSE, CA STRAWBERRY GROWERS INCREASED THEIR USE OF OTHER FUMIGANTS SUCH AS CHLOROPICRIN AND 1,3-DICHLOROPROPENE THAT ARE NOT AS EFFECTIVE AS MEBR. BECAUSE OF THEIR HIGHLY VOLATILE NATURE AND HIGH APPLICATION RATES, FUMIGANTS CAN CAUSE SIGNIFICANT IMPACTS ON HUMAN HEALTH AND THE ENVIRONMENT, AND THEIR USES ARE HIGHLY REGULATED. REGARDLESS, THE CALIFORNIA DEPARTMENT OF PESTICIDE REGULATION HAS DOCUMENTED HUNDREDS OF ACUTE ILLNESSES CAUSED BY ACCIDENTAL FUMIGANT EXPOSURE TO AGRICULTURAL WORKERS AND PEOPLE LIVING NEAR FUMIGATED FIELDS SINCE 2003, MAKING DEVELOPMENT AND USE OF NON-FUMIGANT ALTERNATIVES A PRIORITY. TODAY, FUSARIUM WILT CAUSED BY FUSARIUM OXYSPORUM F. SP. FRAGARIAE (F.O.F.), AND CHARCOAL ROT CAUSED BY MACROPHOMINA PHASEOLINA ARE THREATENING CALIFORNIA'S TWO-BILLION-DOLLAR STRAWBERRY INDUSTRY. THIS PROJECT AIMS TO DEVELOP AND DEMONSTRATE SUPPRESSIVE CROP ROTATIONS AS A COMPONENT OF INTEGRATED NON-FUMIGANT SOILBORNE DISEASE MANAGEMENT STRATEGIES FOR STRAWBERRIES. STUDIES SHOWED THE POTENTIAL OF USING SUPPRESSIVE CROPS TO CONTROL LETHAL SOILBORNE PATHOGENS FOR STRAWBERRIES (E.G., ALLIUM CROPS FOR FUSARIUM WILT, AND SUMMIT 515 WHEAT FOR CHARCOAL ROT). OUR GOAL IS TO EXAMINE THE EFFECTIVENESS OF SUPPRESSIVE CROPS, OPTIMIZE THEM FOR CALIFORNIA STRAWBERRY PRODUCTION SYSTEMS, DEMONSTRATE THEM AT COMMERCIAL SCALE TRIALS, EVALUATE THEIR ECONOMIC FEASIBILITY, AND DISSEMINATE THE RESEARCH OUTCOMES. WE WILL CONDUCT A SERIES OF GREENHOUSE AND FIELD TRIALS, AND COMMERCIAL-SCALE DEMONSTRATIONS OF SUPPRESSIVE ROTATIONS WITH AND WITHOUT ANAEROBIC SOIL DISINFESTATION (ASD), A BIOLOGICAL ALTERNATIVE TO FUMIGATION, FOR CONTROL OF MAJOR SOILBORNE PATHOGENS IN STRAWBERRY. SPECIFICALLY, WE WILL 1) EXAMINE THE EFFECT OF ALLIUM CROPS ON F.O.F. POPULATION IN THE SOIL WITH AND WITHOUT SUMMER ASD IN GREENHOUSE TRIALS, 2) STUDY THE EFFECT OF SUMMIT 515 WHEAT ON M. PHASEOLINA IN THE SOIL WITH AND WITHOUT SUMMER ASD IN GREENHOUSE TRIALS, 3) EXPLORE THE SOIL MICROBIOLOGICAL MECHANISM OF SOIL M. PHASEOLINA SUPPRESSION BY SUMMIT 515 WHEAT, 4) TEST SUPPRESSIVE CROP ROTATIONS WITH OR WITHOUT SUMMER ASD FOR F.O.F. AND M. PHASEOLINA IN STRAWBERRIES AT REPLICATED FIELD TRIALS AND LARGE-SCALE DEMONSTRATION FIELD TRIALS ACROSS COASTAL CALIFORNIA, 5) CONDUCT AN ECONOMIC ANALYSIS OF SUPPRESSIVE ROTATION SYSTEMS, AND 6) DISSEMINATE THE OUTCOMES VIA WORKSHOPS, FIELD DAYS, AND WEBINARS. TO REACH OUT TO LATINO AND RESOURCE-LIMITED GROWERS, WE WILL WORK WITH A LOCAL NGO AGRICULTURE &AMP; LAND-BASED TRAINING ASSOCIATION (ALBA).