Efficacy of Pseudomonas and Streptomyces strains on control of root knot nematode (Meloidogyne incognita) in tomato under greenhouse conditions

Document Type : Original Article

Authors

1 Former M.Sc. Student of Plant Pathology, Islamic Azad University of Malekan, Iran

2 Plant Protection Department- Faculty of Agricultural Sciences- University of Guilan- Rasht- Iran

3 Plant Pathologist and Co-founder of BioSam Company, Montreal, Canada

Abstract

Root-knot nematodes (Meloidogyne spp.) have a wide host range and cause yield loss in many crops and tomato plants are one of the hosts that seriously damaged by the nematodes. In this study, the antagonistic activities of two strains of Pseudomonas fluorescens and two strains as Streptomyces sp. were evaluated against the root knot nematode (M. incognita) infecting tomato plants under greenhouse conditions. The experiment was conducted in a completely randomized design with five treatments and three replicates for each stage. After 60 days, at the harvest, numbers of galls, egg mass and second stage juveniles (J2), also fresh and dry weights and plant length were recorded. The results showed that amongst bacterial treatments, the highest control level with an average of 127 galls/root, 67 eggs/g root and 16 J2/100g soil belonged to P. fluorescens GU5 at before planting stage. The plants treated with this strain also had the highest fresh and dry weights. The P. fluorescens CHA0 treatment was ranked in the second place. Two Streptomyces strains, SH8 and SH20 performance showed less control effects, respectively. Although, application of the nematicide Cadusafos (Rugby) caused the highest efficacy in decreasing infection index (47 galls and 28 egg mass in root) compared with bacterial treatments, but its impact on plant growth traits was less than that of GU5 strain. Applying the treatments before the planting time showed the highest effect in the nematode control. The nematode reproduction factor in the plants treated with the two bacteria was significantly less than that of the controls. 

Keywords

Iranian Journal of Nematology
Volume 1, Issue 1
August 2022
Pages 118-127

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