A5012195557- Plant Pathogens and Fungal Diseases
- Plant-Microbe Interactions and Immunity
- Plant Pathogens and Resistance
- Plant Disease Management Techniques
- Plant Disease Resistance and Genetics
- Legume Nitrogen Fixing Symbiosis
- Microbial Community Ecology and Physiology
- Nematode management and characterization studies
- Plant Physiology and Cultivation Studies
- Plant Pathogenic Bacteria Studies
- Plant pathogens and resistance mechanisms
- Mycorrhizal Fungi and Plant Interactions
- Fungal Plant Pathogen Control
- Plant Virus Research Studies
- Yeasts and Rust Fungi Studies
- Soil Carbon and Nitrogen Dynamics
- Horticultural and Viticultural Research
- Bioinformatics and Genomic Networks
- Agronomic Practices and Intercropping Systems
- Banana Cultivation and Research
- Genomics, phytochemicals, and oxidative stress
- Berry genetics and cultivation research
- Plant Parasitism and Resistance
- Plant and Fungal Interactions Research
- Microbial Metabolic Engineering and Bioproduction
Stellenbosch University
2018-2024
Agricultural Research Service
2014-2024
United States Department of Agriculture
2014-2024
Agriculture and Agri-Food Canada
2024
Summerland Research and Development Centre
2024
Kentville Research and Development Centre
2024
Tree Fruit Research Laboratory
2014-2023
Washington State University
1991-2018
San Joaquin Valley Agricultural Sciences Center
2018
Agricultural Research Organization
2016
Genetic resistance in plants to root diseases is rare, and agriculture depends instead on practices such as crop rotation soil fumigation control these diseases. "Induced suppression" a natural phenomenon whereby due microbiological changes converts from conducive suppressive soilborne pathogen during prolonged monoculture of the susceptible host. Our studies have focused wheat disease "take-all," caused by fungus Gaeumannomyces graminis var. tritici, role bacteria rhizosphere...
Phenazine antibiotics produced by Pseudomonas fluorescens 2-79 and aureofaciens 30-84, previously shown to be the principal factors enabling these bacteria suppress take-all of wheat caused Gaeumannomyces graminis var. tritici, also contribute ecological competence strains in soil rhizosphere wheat. Strains their Tn5 mutants defective phenazine production (Phz-), or mutant genetically restored for (Phz+) were introduced into Thatuna silt loam (TSL) TSL amended with G. tritici. Soils planted...
Soil microbiomes may be harnessed for plant health
ABSTRACT Systematic studies were conducted to elucidate the role of different soil microbial groups in development apple replant disease. Populations targeted microorganisms reduced by application semiselective biocides and pasteurization. Bacteria not implicated disease, because antibiotic chloramphenicol populations bacteria but failed improve growth transplants, while enhanced was achieved at pasteurization temperatures that did alter attributes bacterial community recovered from roots....
ABSTRACT The impact of Brassica napus seed meal on the microbial complex that incites apple replant disease was evaluated in greenhouse trials. Regardless glucosinolate content, amendment at a rate 0.1% (vol/vol) significantly enhanced growth and suppressed root infection by Rhizoctonia spp. Pratylenchus penetrans. High B. cv. Dwarf Essex amendments did not consistently suppress soil populations Pythium or this pathogen. Application low containing 1.0% resulted significant increase recovery...
Brassicaceae seed meal (SM) formulations were compared with preplant 1,3-dichloropropene/chloropicrin (Telone-C17) soil fumigation for the ability to control apple replant disease and suppress pathogen or parasite reinfestation of organic orchard soils at two sites in Washington State. Preplant an SM formulation consisting either Brassica juncea-Sinapis alba B. juncea-B. napus each provided similar levels during initial growing season. Although tree growth was fumigated SM-amended season,...
The effect of seed meals derived from Brassica juncea, B. napus, or Sinapis alba on suppression soilborne pathogens inciting replant disease apple was evaluated in greenhouse trials. Regardless plant source, meal amendment significantly improved growth all orchard soils; however, relative differences pathogen were observed. All suppressed root infection by native Rhizoctonia spp. and an introduced isolate solani AG-5, though juncea often generated a lower level control to other types. When...
Alternatives to soil fumigation are needed for soilborne disease control. The aim of this study was test anaerobic disinfestation (ASD) as an alternative control critical pathogens in Californian strawberry production. Controlled environment experiments were conducted at 25 and 15 °C different materials carbon sources ASD using inoculated with Verticillium dahliae . Field trials three locations comparing 20 Mg ha −1 rice bran (RB) against fumigated untreated controls, steam, mustard seed...
ISHS VIII International Symposium on Chemical and Non-Chemical Soil Substrate Disinfestation ANAEROBIC SOIL DISINFESTATION FOR BORNE DISEASE CONTROL IN STRAWBERRY AND VEGETABLE SYSTEMS: CURRENT KNOWLEDGE FUTURE DIRECTIONS
Abstract Background The design of ecologically sustainable and plant-beneficial soil systems is a key goal in actively manipulating root-associated microbiomes. Community engineering efforts commonly seek to harness the potential indigenous microbiome through substrate-mediated recruitment beneficial members. In most practices, microbial mechanisms rely on application complex organic mixtures where resources/metabolites that act as direct stimulants groups are not characterized. Outcomes...
Isolates of Gaeumannomyces graminis var. tritici, the causal agent take-all wheat, varied in sensitivity vitro to antibiotics phenazine-1-carboxylic acid (PCA) and 2,4-diacetylphloroglucinol (Phl) produced by fluorescent Pseudomonas spp. shown previously have potential for biological control this pathogen. None four isolates G. avenae examined were sensitive either at concentrations tested. The single isolate tested was insensitive PCA 1.0 (mu)g/ml. fluorescens 2-79 chlororaphis 30-84, both...
Environmental bacteria are exposed to a myriad of biotic interactions that influence their function and survival. The grazing activity protozoan predators significantly impacts the dynamics, diversification, evolution bacterial communities in soil ecosystems. To evade predation, employ various defense strategies. Soil-dwelling Pseudomonas fluorescens strains SS101 SBW25 produce cyclic lipopeptide surfactants (CLPs) massetolide viscosin, respectively, quorum-sensing-independent manner. In...