The biological properties of bacteria-assiociants Myzus cerasi F. in territory of the Saratov region weree studied. 39 strains of bacteria were revealed. 66.6% of the strains were able to use glucose, 87.0% – fixed molecular nitrogen, 56.3% – had the ability to grow at 10 °C, 92.1% of the isolated cultures were alkalotolerant and grown at pH10.
