بررسي اثر سويه هاي Rhizobium leguminosarum بر بيماري پوسيدگي فوزاريومي ريشه لوبيا

The effect of Rhizobium leguminosarum strains on Fusarium root rot disease of bean

Root rot is one of the most important disease of bean. Management of the disease is difficult because the pathogen is soil borne. In this study the effect of some strains of Rhizobium leguminosarum bacteria on Fusarium root rot of local Khomein chitti bean variety were evaluated in greenhouse condition. This experiment was conducted with 10 treatments (inoculation with 5 strains of Rhizobium, Rovral-TS fungicide, and healthy and infected control with water and suger-water) based on completely randomized design with four replications during 2007-2008. Results showed that Rhizobium R-115 had the highest effect on disease severity reduction. This treatment reduced disease severity by 42% compared with infected control. There was no significant difference in disease severity reduction between the other Rhizobium tretments and Rovral-TS fungicide. R-115 increased N concentration (%1.59) compared with %0.74 in infected control. Also all Rhizobium treatments with increasing N concentration, improved plant growth with higher height, dry root and aerial plant weight.