Preparing suspension of R. solanacearum
1 mL suspension of R. solanacearum stock solution was addedto a triangular flask of nutrient broth, and cultured at 30◦C for48 h. Then diluted to 1 × 108cfu/mL suspension by sterile water,0.1 mL diluted suspension was inoculated to the nutrient agarplates under the aseptic operation. Plates were placed at 30◦C for48 h, Single colonies were transferred to nutrient broth at 35◦Cfor 24 h, a final suspension of 1 × 108cfu/mL R. solanacearum wasprepared.