Controlul biologic al bacteriilor patogene care ataca plantele de cultura

Abstract

In order to obtain microbian antagonists ten bacteria strains have been isolated. The strains isolation were made from nature: fromcereals, medicinal plants, weeds, etc. There were selected, four strains of Bacillus subtilis, wich had a strong antagonistic effect on the pathogenic bacterias (50-80%) after the tests made on vine and vegetables. The strains having a high rate of spotrulation, as spore has the capacity of releasing antibacterial lipoprotein substances with antibiotic function. The effect of the microbian antagonists has been studied in the laboratory against some strains of Ervinia carotovora, Xanthomonas campestris, Xanthomonas phaseoli, Agrobacterium tumefaciens, etc. Antagonists obtained from microbial cultures of Bacillus subtilis have important advantage of having also the rol as biostimulators on the plants, comparatively to the controls.