Powders of kudzu, velvetbean, and pine bark added to soil increase microbial population and reduce Southern blight of soybean

Abstract

Southern blight ( ) of soybean ( ) is an important disease throughout the world. Some soil amendments can reduce disease levels by improving soil microbial activity. The main goals of this study were to investigate the effects of soil amendments such as dried powders of kudzu ( ), velvetbean ( ), and pine bark ( ), on soil microbial population and disease caused by on soybean. Pine bark, velvetbean (mucuna) and kudzu (25 g kgwas the bacteria most frequently isolated in soils with velvetbean or kudzu (NA ~ log 5.7 CFU g -1 stimulated increase in population of population was higher in A than in NA (NA ~ bark stimulated increases in populations of soil population increased with addition of kudzu (NA ~ log bark can increase antagonistic population in soil and reduce disease. Additional keywords:, stem rot, soil amendments, , .RESUMO Pós-secos de kudzu, mucuna e casca de pinus adicionados ao solo aumentam a população microbiana e diminuem a murcha por esclerócio em soja. A murcha ( ) da soja ( ) é uma doença mundialmente importante. Alguns resíduos orgânicos quando adicionados ao solo podem reduzir a doença devido ao aumento da atividade microbiana. Neste estudo investigaram-se os efeitos de pós-secos de kudzu ( ), mucuna ( ) e casca de pinus ( ) adicionados ao solo, na população de microrganismos e na doença em soja. Casca de pinus (CP), mucuna e kudzu (25 g kg -1

Plant species diversity for sustainable management of crop pests and diseases in agroecosystems: a review

“…Blanchart et al (2006) reported higher densities of facultative phytophagous, bacterial-feeding and predatory nematodes and lower densities of obligatory phytophagous (Criconemella, Scutellonema and Meloidogyne) nematodes, resulting from intercropping maize with M. pruriens. Blum and Rodriguez-Kabana (2006) found that addition of extracts of velvetbean (M. deeringiana) to soils decreased the incidence of southern blight in soybean (caused by Sclerotium rolfsii), while increasing the general bacterial population, particularly Bacillus megaterium, Enterobacter aerogenes and Pseudomonas putida, while addition of extracts of kudzu (Pueraria lobata) increased both fungal and bacterial populations, particularly Trichoderma koningii, Penicillium citreonigrum and P. herquei fungi and B. megaterium, E. aerogenes and P. putida bacteria. In particular, the population of P. putida was found to be negatively correlated with disease incidence.…”

Diseases of Edible Oilseed Crops

“…But integrated approach involving rotation with other crops such as cotton or corn and soil amendments with organic matter can be effective in reducing the inoculum of the pathogen. Dried powders of kudzu (Pueraria lobata), velvet bean (Mucuna deeringiana), and pine bark (Pinus taeda) each at the rate of 25 g/kg stimulate increases in popula tions of antagonistic microorganism such as Trichoderma koningii and Penicillium citreonigrum and Penicillium herquei and are useful in reducing the incidence of the disease (Blum and Rodriguez-Kabana 2006b). Bacillus thuringiensis subsp.…”