a. Two-way ANOVA of the reference plants used as internal standards across 19 screens carried out from 2011 to 2018.

Experiment take down date is abbreviated as TD. Uninoculated Chardonnay was not included in the analysis. b. Least square means (LSM) comparisons of ELISA readings of bacterial levels using Tukey's test with take down date and controls as variables. Results significantly separate the resistant, intermediate and susceptible reference plants. Confidence level (CL) were established at 95%. Uninoculated Chardonnay was not included in the analysis.