METHOD: Both IFAS and Visual Examination CONDITIONS: Green House - 18h light METHOD NARR: Roots and basal stems of 4-wk old plants were inoculated with Clavibacter michiganensis subsp. sepedonicus strain NDCs-OFF by placing themurs. Symptoms were noted 6 weeks post-inoculation. Stem tissue samples were prepared for IFAS to determine C.m. subsp. sepedonicus populations. In a second screening, analysis was based only on IFAS testing due to atypicalt screening. Stability of immune clones was tested by repeating the test with rooted cuttings. Test clones of acl with potential immunity were further analysed using cuttings and also tuber grown clones. RESULTS NARR: Trialings): 0 IFU/MF=Immune, 1-10 IFU/MF=Resistant, 11-20 IFU/MF=Low Resistance, >20 IFU/MF=Susceptible. Immune Test Clone Trials: 0 IFU/g=Immune, 10-100 IFU/g=Resistant, 1000-10000 IFU/g=Low Resistance, >100000 IFU/g=Susceptible. AUTHORth conditions such as light sensitivity and intensity may have affected the results. Apparent immunity in some species may have resulted from improper inoculation or a form of young seedling resistance. There are many acof resistance among clones and between screenings, making a resistance rating difficult.