Foliar spraying with bacterial biocontrol agents for the control of common bacterial blight of bean

Abstract

The objective of this work was to evaluate the effect of foliar spraying with bacterial biocontrol agents (BBAs) on the control of common bacterial blight (CBB) of bean, and on the induction of systemic resistance in bean plants. CBB control by BBAs was evaluated by spraying bean leaves 48 and 24 hours before and after pathogen inoculation (BPI and API, respectively), with: DFs93, Bacillus cereus; DFs513, Pseudomonas veronii; DFs769, B. cereus; the C01 combination, DFs93 + DFs769 + DFs831 (Pseudomonas fluorescens); the C03 combination, DFs348 (Bacillus sp.) + DFs769 + DFs831; and water (control). Systemic effects were analyzed after spraying DFs513, DFs769, C03, and water 72 and 48 hours BPI. Phaseolin production induced by DFs348, DFs513, DFs769, DFs831, and water was also assessed. DFs513, DFs769, and C03 significantly reduced disease incidence (area under disease progress curve), regardless of spraying time and disease severity when sprayed 72 and 48 hours BPI. The DFs769 and DFs831 isolates induced the accumulation of phytoalexin (phaseolin). Therefore, DFs513, DFs769, and C03 show potential for the biocontrol of CBB when applied preventively on bean leaves, besides inducing systemic resistance.

Biocontrol Potential of Sclerotinia sclerotiorum and Physiological Changes in Soybean in Response to Butia archeri Palm Rhizobacteria

“…This indicates that the biopriming of the soybean seeds with rhizobacteria was effective for the elimination of the apparent symptoms of the disease. Bacteria associated with plant roots have been shown to have potential for the control of a number of diseases the affect agricultural crops e.g., [61][62][63][64][65]. The bacteria of the genera Enterobacter and Bacillus, in particular, have attracted considerable attention as the most promising candidates for biocontrol agents of the rhizophere and endorhiza of crop plants [66,67].…”

The Abilities of Bacteria and Yeast Isolated from Vermicompost Water Extract to Inhibit Alternaria solani in vitro and Early Blight Disease on Tomato

“…jamur patogen (Sangiogo et al, 2018). Isolat mikrob yang dapat menekan penyakit bercak cokelat ini dapat menghasilkan zona hambat secara in vitro sehingga kemungkinan penekanan penyakit dapat pula dikarenakan dihasilkannya metabolit sekunder yang dapat menghambat patogen.…”

Indução de fitoalexinas por isolados de Bacillus spp e Trichoderma spp

“…Dentre os agentes bióticos descritos como produtores de substâncias elicitoras de fitoalexinas estão fungos do gênero Trichoderma (BENÍTEZ et al, 2004) e bactérias do gênero Bacillus (SANGIOGO et al, 2018). O presente projeto objetiva a verificação do potencial de utilização de isolados fúngicos e bacterianos de microrganismos para indução de fitoalexinas em soja.…”