Evaluation of the efficiency of bacteria Pseudomonas fluorescens and Azotobacter chroococcum in the control of bacterial soft rot disease caused by bacteria Pectobacterium carotovorum

Abstract

The results showed the efficacy of bacteria Pseudomonas fluorescens and Azotobacter chroococcum and their mixture in inhibiting the soft rot disease caused by the bacteria Pectobacterium carotovorum and reducing the percentage of the disease, as the treatment of using pathogen and the mixture of the two types of bacteria A. chroococcum and P. fluorescens and significantly different from the other treatments as the injury rate reached 26.6%, and the results showed that the use of A.chroococcum treatment was superior to the other treatments in increasing the chlorophyll content, reaching 46.59 mg. L-1, The treatment of using bacteria A. chroococcum showed a superiority in the number of marketable tubers, reaching 4.5 tuber / plant, and the lowest number of non-marketable tubers, reaching 1.09 tuber / plant, and the highest average weight of the marketable tubers was 947.05 g / plant. in the treatment of using a mixture of A. chroococcum and P. fluorescens and the treatment of using A. chroococcum, which amounted to 928.51 g / plant, with a significant difference from all other treatments, while the treatment of using bacteria A. chroococcum gave the lowest weight in the yield of a single unmarketable plant reached 41.95 g / plant.