Initial identification of common genera; Gram-negative bacteria; Agrobacterium; Erwinia and pantoea; Erwinia amylovora group; Erwinia soft rot group; Pantoea; Pseudomonas; Acidovorax and xylophilus; Buirkholderia; Ralstonia; Xanthomonas; Xylella fastidiosa; Rhizomonas suberifaciens; Gram-positive bacteria; Streptomyces; Bacillus; Clostridium; Fastidious phloem-limited bacteria; Cell-wall free bacteria; Molecular techniques; DNA isolation procedure; Serological techniques; Automated techniques.