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CHAIRMANS MESSAGE TO THE HANDLERS
LETTUCE BREEDING USDAARS
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aphids assay assess ATCC backcrossing bacteria beds bioaerosol breeding lines CALIFORNIA LETTUCE RESEARCH colf coli collected colonies Contans corky root crisphead crop cultivars dahliae Davis Department of Plant detection determine developed disease resistance downy mildew drip Dyne-Amic EFIP Endura evaluated field experiments field trial fl oz/A Fusarium wilt genetic genotypes germplasm Green greenhouse iceberg identified infested inoculated inoculum intercrops introgressed irrigation water isolates leafminer leafy lettuce drop lettuce mosaic virus Lettuce Research Board lettuce types levels Magenta box mapping markers membrane method Michelmore microsclerotia negative numbers overhead irrigation pathogen phages phenotypes plant samples plates plots populations replicated resistance genes rifampicin Romaine lettuce Salinas Valley samplers sampling date sclerotia screening seed selected serriola significantly Silwet L77 soil sources of resistance Sphingomonas spinach springtails sprinkler strains stx2 stxl suberifaciens susceptible Suslow syrphid tested thermotolerant coliform thrips tipburn treatments University of California Verticillium wilt