Inhibitory effects of some isolates of Pseudomonas fluorescens on tomato root-knot nematode, Meloidogyne incognita

Root-knot nematode is one of the most important nematodes world wide, due to its damage on different species of plant. With concern to human health and environmental hazards of chemical nematicides, research to introduce new methods for management of nematode population is important. The objective of this study was to evaluate the effect of different strains of P. fluorescens in control of root-knot nematode. In this study, inhibitory effects of 9 strains of this bacterium was evaluated in In vitro and under greenhouse conditions. Although the strains cause mortality in second stage juveniles in In vitro, the mortality levels were significantly different in treatments. On the other hand, the tested strains had different levels of nematicidal potential. In the greenhouse conditions, more strains reduced knots formation and nematode reproduction. The strains 2 and 16 which were isolated from rhizosphere soils in Boyerahmad region were more effective than P. fluorescens CHA0, which reduced reproduction rate of the nematode significantly. According to the results none of the bacterial strains could increase the plant growth factors of tomato as compared to the control. Root-knot nematode is one of the most important nematodes world wide, due to its damage on different species of plant. With concern to human health and environmental hazards of chemical nematicides, research to introduce new methods for management of nematode population is important. The objective of this study was to evaluate the effect of different strains of P. fluorescens in control of root-knot nematode. In this study, inhibitory effects of 9 strains of this bacterium was evaluated in In vitro and under greenhouse conditions. Although the strains cause mortality in second stage juveniles in In vitro, the mortality levels were significantly different in treatments. On the other hand, the tested strains had different levels of nematicidal potential. In the greenhouse conditions, more strains reduced knots formation and nematode reproduction. The strains 2 and 16 which were isolated from rhizosphere soils in Boyerahmad region were more effective than P. fluorescens CHA0, which reduced reproduction rate of the nematode significantly. According to the results none of the bacterial strains could increase the plant growth factors of tomato as compared to the control.