Sensitivity of Rhizobium species to certain fungicides

Summary Thirty-three strains of different species of rhizobia were seeded into medium 79 agar. Discs impregnated with 3, 0.3, 0.03 and 0.003%, corresponding to 10, 1, 1/10 and 1/100 the recommended rate of application, of fungicides TMTD, Rhizoctole, Phygon, Ceresan and Orthocide 75 were placed on the seeded agar. After 120 hrs, zones of inhibition were measured. The 3, 0.3 and 0.03% concentrations of the five fungicides were inhibitory to most rhizobia tested in different degrees. The 0.003% level of these fungicides while toxic to certain strains, was not so for others.Deceased August 6, 1968.