Formulation of bionematicides based on bacteria for the control of the lesion nematode in common bean

Abstract

Bacteria belonging to the genus Bacillus can promote plant growth and suppress plant-parasitic nematode populations. Based on this hypothesis, eight strains of the bacterium (SF 262, SF 264, SF 266, SF 267, SF 268, SF 271, SF 292 and SF 629) were formulated and applied as a seed treatment and/or sprayed on the soil surface with the aim of controlling Pratylenchys brachyurus in common bean under field conditions. The application of the bacterial isolates neither improved the grain yield and the root mass nor reduced the number of nematodes in the soil and in the roots of common bean. Thus none of the isolates of Bacillus spp. evaluated in this work are promising for the control of the lesion nematode on common bean.

Bacillus spp. isolates for the control of Meloidogyne incognita in common bean

“…The pathogen multiplication in the bean roots, represented by the mean number of eggs per plant, occurred without significant interference of the antagonist, ranging from 3,062.5 to 9,765.0 eggs per plant. Few studies were conducted under field conditions to evaluate the effect of Bacillus species on nematode control (Chen & Dickinson, 2004), mainly in Brazil (Oliveira et al, 2015). Microbiostasis and variations in temperature, humidity, and soil microbiota population in the field can interfere with the dynamics of the antagonists and nematodes throughout the host crop cycle, leading to inefficiency of the isolates selected as promising under controlled conditions (Oliveira et al 2015).…”

“…Few studies were conducted under field conditions to evaluate the effect of Bacillus species on nematode control (Chen & Dickinson, 2004), mainly in Brazil (Oliveira et al, 2015). Microbiostasis and variations in temperature, humidity, and soil microbiota population in the field can interfere with the dynamics of the antagonists and nematodes throughout the host crop cycle, leading to inefficiency of the isolates selected as promising under controlled conditions (Oliveira et al 2015). In the present study, isolates 57 and 63 did not control M. incognita in the greenhouse experiment using sterilized soil and under controlled conditions.…”