THIS INTEGRATED RESEARCH AND EXTENSION PROJECT WILL LEAD TO EFFICIENT CONTROL OF SOILBORNE PATHOGENS BY DEVELOPING A MULTI-TACTIC SOILBORNE DISEASE MANAGEMENT PLAN. CURRENT FUMIGATION PRACTICE IS TO APPLY ONE RATE ACROSS WHOLE FIELDS BUT PATHOGEN DISTRIBUTION IS UNEVEN AND AREAS WITH LITTLE DISEASE NEED LITTLE OR NO FUMIGANT. PEST DISTRIBUTION MAPS WOULD ENABLE FUMIGANT APPLICATION AT THE APPROPRIATE DOSE WHERE NEEDED. WE PROPOSE TO MAP SOILBORNE PESTS AND THEN PERFORM SITE-SPECIFIC FUMIGANT APPLICATION COMBINED WITH CROP ROTATION TO MANAGE SOILBORNE PESTS. THIS PROJECT IS RELEVANT TO THE METHYL BROMIDE TRANSITIONS PROGRAM BECAUSE SOILBORNE PEST POPULATION MAPS WILL BE USED TO IMPROVE CONTROL OF PESTS IN STRAWBERRY AND ROTATIONAL CROP VEGETABLES BY IMPROVING FUMIGANT USE EFFICIENCY. SOILBORNE PATHOGENS VERTICILLIUM DAHLIAE AND PHYTOPHTHORA SPP. AND EMERGING PESTS MACROPHOMINA PHASEOLINA AND FUSARIUM OXYSPORUM F. SP. FRAGARIAE ARE SERIOUS THREATS TO STRAWBERRY AND V. DAHLIAE IS PROBLEMATIC ON VEGETABLES LIKE LETTUCE. OUR HYPOTHESIS IS THAT THIS SYSTEM WILL LEAD TO MORE EFFECTIVE USE OF FUMIGANTS WITH 20% LESS FUMIGANT APPLIED AND DEVELOP NEW INTEGRATED PEST MANAGEMENT STRATEGIES FOR STRAWBERRY AND VEGETABLES. TO DO THIS, SOIL FROM SELECTED FIELDS ARE SAMPLED IN A GRID-LIKE PATTERN WITH PATHOGENS QUANTIFIED USING MOLECULAR AND PLATING ASSAYS. GPS-CONTROLLED FUMIGATION EQUIPMENT IS USED FOR VARIABLE RATE APPLICATION TO MANAGE PATHOGEN PRESSURE AS IDENTIFIED IN THE DISTRIBUTION MAP. THE EFFECTIVENESS OF THIS APPROACH TO SOILBORNE DISEASE MANAGEMENT WILL BE ASSESSED BY A COMBINATION OF HIGH-RESOLUTION YIELD DATA AND PLANT HEALTH DATA IN STRAWBERRY AND VEGETABLES OVER A 3-YEAR PERIOD.