Efficacy of acibenzolar-S-methyl and rhizobacteria for the management of foliar blight disease of amaranth

Chitra B. Nair, Narayanan K. Anith


We evaluated the influence of Acibenzolar-S-Methyl (ASM; 0 to 100 ppm concentrations), a chemical activator, and four Plant Growth Promoting Rhizobacteria (PGPR; Pseudomonas fluorescens PN026R, P. putida 89B61, Bacillus pumilus SE34, and B. subtilis GB03) on amaranth (Amaranthus tricolor L.) foliar blight (Rhizoctonia solani Kühn) suppression. In vitro and in vivo experiments were conducted both under sterile and non-sterile soil conditions in which the PGPR and activator were tried both individually and in combination. Results indicate PGPR induced resistance against R. solani in a susceptible amaranth variety, ‘Arun’. A native isolate, P. fluorescens PN026R was particularly effective in suppressing the disease and promoting plant growth. Plants treated with PN026R showed lower disease incidence and disease severity; 67 and 35 % respectively compared to 92 and 52 % for plants inoculated with pathogen alone. Combined application of PGPR and ASM was, however, more effective with disease incidence and disease severity of 42 and 21 % respectively.


Amaranthus, Rhizoctonia solani, Biological control, ISR, ASM, PGPR

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A KAU publication [CODEN: JTAGEI; ISSN 0971-636X; eISSN 0973-5399]