OVER THE LAST 20 YEARS, VEGETABLE PRODUCTION IN CALIFORNIA HAS SHIFTED FROM PLATING FIELD WITH SEEDS TO TRANSPLANTS. TRANSPLANT GREENHOUSES HAVE EMERGED AS A NEW TYPE OF PRODUCTION SYSTEM IN CALIFORNIA WITH SIGNIFICANT PEST MANAGEMENT NEEDS AND CHALLENGES. RECENT SURVEYS IN COOPERATING VEGETABLE GREENHOUSES IN THE CENTRAL VALLEY, INDICATE LOSSES ARE CAUSED BY SEVERAL FUNGAL AND BACTERIAL DISEASES. CURRENTLY THERE ARE NOT BEST MANAGEMENT PRACTICES (BMP) SPECIFICALLY TAILORED FOR THIS TYPE OF GREENHOUSE PRODUCTION, MAKING FUNGICIDE USE THE ONLY TOOL AS AN ATTEMPT TO CONTROL. TO DEVELOP CULTURAL STRATEGIES WHICH CAN MINIMIZE DEPENDENCY ON CHEMICALS, REQUIRES UNDERSTANDING HOW PATHOGENS ARE MOVING WITHIN PRODUCTION HOUSES AND CONDITIONS WHICH ARE FACILITATING INFECTION. TO ADDRESS THESE CHALLENGES, WE INTEGRATED RESEARCH AND EXTENSION OBJECTIVES IN THIS MULTI-STATE STUDY:1. CONDUCT SITE-SPECIFIC HAZARD ANALYSIS OF CRITICAL CONTROL POINTS (HACCP) WITH COLLABORATING NURSERIES2. DEVELOP CULTURE PRACTICES TO REDUCE PATHOGEN SPREAD AND INFECTION AT CRITICAL CONTROL POINTS, AND CONDUCT VALIDATION STUDIES (AT COOPERATING FACILITIES) TO DETERMINE EFFICACY3. SCREEN CHEMICAL AND BIOLOGICAL FUNGICIDES FOR EFFICACY IN MANAGING PATHOGENS4. DISSEMINATE NEW MANAGEMENT RECOMMENDATIONS THROUGH GROWER MEETINGS, WORKSHOPS, NEWSLETTER ARTICLES.IN LINE WITH CARE PRIORITIES, OUR GOAL IS TO TO DEVELOP AND IMPLEMENT SOLUTIONS TO CRITICAL PRODUCER PROBLEMS ASSOCIATED WITH CROP PRODUCTION, PROTECTION, AND PRODUCT QUALITY. STAKEHOLDERS ARE PARTICIPANTS IN VALIDATION AND OUTREACH EFFORTS, AND PROJECT ADVISORS.OUTCOME: DEVELOP BMPS SPECIFICALLY TAILORED FOR GREENHOUSE VEGETABLE TRANSPLANT PRODUCTION AS A MEANS TO REDUCE PATHOGEN SPREAD, AND PESTICIDE USE AND IMPROVE ECONOMIC VIABILITY THROUGH REDUCTION IN DISEASE LOSSES.