On the effects of some pesticides on Rhizobium and isolation of pesticide-resistant mutants

Summary The in vitro effects on Rhizobium of two herbicides and two fungicides that are often used in Sweden were studied. The sensitivity of the strains seems to be specific since the Rhizobium meliloti strains generally were tolerating higher doses of pesticides than strains of Rh. trifolii and Rh. leguminosarum. It was possible to isolate mutants that tolerated much higher doses of the pesticides than the wild type strains.