Soil factors influencing the efficacy of liquid swine manure added to soil to kill<i>Verticillium dahliae</i>

Conn, K. L.; Lazarovits, George

doi:10.1080/07060660009500459

Cited by 41 publications

(16 citation statements)

References 2 publications

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“…These results agree with previous reports, which advocated that organic materials reduce disease incidence caused by many plant pathogenic bacteria, fungi and nematodes (Abawi and Widmer 2000, Conn and Lazarovits 2000, Lazarovits et al 2001.…”

Section: Effects Of Fym On Hlbsupporting

confidence: 83%

Influence of Long-term Use of Organic and Inorganic Nutrients on HLB Disease of Wheat under Rice-Wheat Cropping Pattern

Bhandari¹,

Regmi²

2014

Nepal Agric. Res. J.

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Helminthosporium leaf blight (HLB) is one of the most destructive diseases of wheat in terai (plain) region of Nepal. This study was conducted to determine the effect of long-term application of various levels of nitrogen (N), phosphorus (P), potassium (K) and organic nutrients on HLB disease of wheat. The experiment was superimposed on long-term fertility experiment conducted in RCB design with three replications under rice-wheat cropping pattern at National wheat research program (NWRP), Bhairahawa, Nepal. The treatments include various combinations of nitrogen 100 kg ha -1 , phosphorus 0 and 60 kg ha -1 , and potash 0, 50 and 100 kg ha -1 with or without Sesbania (Sesbania cannabina) and farm yard manure (FYM). Area under disease progress curve (AUDPC) was calculated using the disease scores and yield parameters were recorded. Among the inorganic nutrients, long-term deficiency of potash in the field markedly enhances the HLB disease. Application of phosphorus in various doses increased the HLB severity in absence of potash. Regular application of at least potash 50 kg ha -1 in wheat noticeably reduced the HLB disease. Regular use of FYM 10 ton ha -1 for long-term considerably reduced the HLB disease but long-term use of Sesbania as green manure did not show any impact on HLB severity. Inclusion of potash in nutrients considerably increased the yield and thousand grain weight (TGW) of wheat. In long term, balanced use of inorganic and organic nutrients with special attention on regular inclusion of potash and FYM in the nutrient combinations is vital in suppression of HLB disease under rice-wheat cropping pattern.

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Section: Effects Of Fym On Hlbsupporting

confidence: 83%

Influence of Long-term Use of Organic and Inorganic Nutrients on HLB Disease of Wheat under Rice-Wheat Cropping Pattern

Bhandari¹,

Regmi²

2014

Nepal Agric. Res. J.

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“…Commercially purchased VFAs adjusted to identical concentrations found in LSM reproduced all the LSM killing activity. Since only the acidic forms of VFA molecules are toxic, disease control only occurs in acidic soils (Conn and Lazarovits 2000). In soils where pH levels are higher than 5.5 VFAs are not toxic to microorganisms.…”

Section: Mechanism Of Action Of Materials Containing Volatile Fatty Amentioning

confidence: 99%

Managing Soilborne Disease of Potatoes Using Ecologically Based Approaches

Lazarovits

2010

Am. J. Pot Res

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Soil fumigation and planting resistant cultivars remain the primary means for control of soilborne plant diseases. Fumigation however, is being constrained by increased costs, urbanization, and its negative environmental impacts. Resistance genes to soilborne pathogens are not available for many crop species. Using verticillium wilt as model disease we examined the potential of non chemical alternatives, specifically the use of organic amendments and green manures, as disease management tools. Application of organic products reduces disease incidence in controlled settings but its application in commercial use was hampered by inconsistent efficacy. Studies now have demonstrated that by-products of animal and plant production, such as meat and bone meal, feather meal, poultry and swine manure, soy meal, etc. can significantly reduce diseases but that the level of control obtained is product and soil specific. Three mechanisms of action for pathogen reduction were identified: 1) generation of toxic compounds such as ammonia and nitrous acid from high nitrogen-containing materials, 2) presence of volatile fatty acids (e.g. vinegar) and 3) alterations in biological agents that may suppress the activity of plant pathogens. For products that work mostly through the generation of active chemical ingredients, knowing the properties that regulate efficacy allows targeting their use to specific locations and thus, increased activity and consistency. Much less is known about how such materials influence rhizosphere residents involved in regulating plant health. New molecular technologies are being implemented to identify key players in maintaining root health. Through an understanding of the microbial soil ecosystem we should be able to develop disease control strategies that are more economical to growers and are more environmentally benign.Resumen La fumigación del suelo y el uso de variedades resistentes permanecen como los primeros medios para controlar las enfermedades vegetales originadas en el suelo. No obstante, la fumigación está siendo limitada por el aumento en los costos, la urbanización, y sus impactos ambientales negativos. Los genes de resistencia a los patógenos del suelo no están disponibles para muchas especies de cultivos. Usando el modelo de enfermedad del marchitamiento por verticillium, examinamos el potencial de alternativas no químicas, específicamente el uso de mejoradores orgánicos y abonos verdes, como herramientas para el manejo de enfermedades. La aplicación de productos orgánicos reduce la incidencia de la enfermedad en condiciones controladas, pero su aplicación en uso comercial se impidió por eficacia inconsistente. Ahora los estudios han demostrado que los sub-productos de la producción vegetal y animal, tales como carne y harina de hueso o de plumas, estiércol de bovinos y cerdos, harina de soya, etc., pueden reducir las enfermedades significativamente, pero el nivel de control obtenido es producto específico del suelo. Se identificaron tres mecanismos de acción para la reducción del patóge...

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“…However, some soil amendments, e.g. broccoli residues, lignin or liquid swine manure, decrease the infection potential of Verticillium (Subbarao et al 1999;Conn and Lazarovits 2000;Debode et al 2002). On the other hand, the broad host range reduce the potential of crop rotation in suppressing the pathogen.…”

Section: Introductionmentioning

confidence: 96%

Impact of formulation procedures on the effect of the biocontrol agent Serratia plymuthica HRO-C48 on Verticillium wilt in oilseed rape

Müller

Berg

2007

BioControl

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Verticillium wilt is an important disease in oilseed rape with an increasing importance worldwide. Currently, there are no methods available to suppress the pathogen. A biological protection strategy on the basis of the plant-beneficial bacterium Serratia plymuthica HRO-C48 to control Verticillium dahliae in oilseed rape was developed. Three different techniques to apply the biocontrol agent to seeds, namely pelleting, film coating and bio-priming, were evaluated considering the influence on the control activity, cell stability during storage and practical feasibility. Neither the treatment nor the inoculum density was found to influence the abundances of HRO-C48 in the rhizosphere after 30 days. Serratia treatment using bio-priming and pelleting resulted in a statistically significant biocontrol in comparison to the non-bacterized controls. Additionally, survival of HRO-C48 differed between treatments, and was the highest using bio-priming at 20°C, and pelleting at 4°C. In conclusion, the procedure of bio-priming, which was developed in line with this study, resulted in a stable and efficient formulation of S. plymuthica on rape seed. This technology opens a possibility to develop a commercial Serratia formulation to protect oilseed against V. dahliae.

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Soil factors influencing the efficacy of liquid swine manure added to soil to killVerticillium dahliae

Cited by 41 publications

References 2 publications

Influence of Long-term Use of Organic and Inorganic Nutrients on HLB Disease of Wheat under Rice-Wheat Cropping Pattern

Influence of Long-term Use of Organic and Inorganic Nutrients on HLB Disease of Wheat under Rice-Wheat Cropping Pattern

Managing Soilborne Disease of Potatoes Using Ecologically Based Approaches

Impact of formulation procedures on the effect of the biocontrol agent Serratia plymuthica HRO-C48 on Verticillium wilt in oilseed rape

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