Combining Biocontrol Agents to Reduce the Variability of Biological Control

Guetsky, Ruth; Shtienberg, D.; Elad, Y.; Dinoor, A.

doi:10.1094/phyto.2001.91.7.621

Cited by 256 publications

(128 citation statements)

References 35 publications

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“…Moreover, the effect of the these factors and their interaction were insignificant (Table 2). This indicates that the control efficacy achieved by with Z1 was independent of the environmental conditions as previously reported by Guetsky et al (2001) against B. cinerea. This result could be explained by the environment of the wound which may protect the antagonistic yeast against from the adverse effects of the environmental factors studied here or alternatively by the time lapse between biocontrol agent application and pathogen inoculation.…”

Section: Combined Effect Of Temperature and Relative Humidity On Lesisupporting

confidence: 80%

Effects of Temperature and Relative Humidity on the in Vitro and in Vivo Radial Growth of Penicillium Italicum and on the Biocontrol Activity of Pichia Guilliermondii, Strain Z1

Guilli¹,

Ibriz²,

Lahlali³

et al. 2011

Acta Hortic.

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The objective of this study was to assess the effect of temperature (5-25°C) on the 'in vitro' and 'in vivo' growth rates of Penicillium italicum and to determine the combined effect of temperature and relative humidity (45 to 100%) on lesion size of this pathogenic fungus on Valencia late oranges, either alone or in combination with the antagonistic yeast strain Z1 of Pichia guilliermondii Wickerham. Statistical analysis showed a significant effect of temperature on the 'in vitro' and 'in vivo' radial growth of P. italicum with the maximum growth observed at temperature of 25°C. In both cases, no growth was observed at a temperature of 35°C. These factors had a significant effect on P. italicum lesion size when it was applied alone on Valencia late oranges and insignificant when yeast strain Z1 was applied 24 h before P. italicum inoculation. Our results confirm previous 'in vitro' findings that a w has a greater influence than temperature on P. italicum growth and highlight that the strain Z1 showed high antagonistic potential against this pathogen over a range of temperature-relative humidity regimes favouring P. italicum development.

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Section: Combined Effect Of Temperature and Relative Humidity On Lesisupporting

confidence: 80%

Effects of Temperature and Relative Humidity on the in Vitro and in Vivo Radial Growth of Penicillium Italicum and on the Biocontrol Activity of Pichia Guilliermondii, Strain Z1

Guilli¹,

Ibriz²,

Lahlali³

et al. 2011

Acta Hortic.

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“…Lahlali (2006) reported a greater effect of humidity than temperature on the strain K population density on the apple surface under controlled laboratory conditions. Furthermore, Guetsky et al (2001) reported effects of temperature, relative humidity, and spray timing combinations on the biocontrol efficacy of Bacillus mycoides and Pichia guilermondii against Botrytis cinerea under laboratory conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Fungicide treatment is the most common strategy used to control this pathogen, but the intensive use of fungicides such as thiabendazole (TBZ) and imazalil (IMZ) has led to the emergence of resistant strains of P. expansum (Spotts and Cervantes 1986;Vinãs et al 1993;Guetsky et al 2001). This fact, associated with growing public concern for human health and environmental hazards, highlights the need to develop alternative methods for controlling post-harvest diseases of apples (Wisniewski and Wilson 1992;Smilanick 1994).…”

mentioning

confidence: 99%

Assessment of Pichia anomala (strain K) efficacy against blue mould of apples when applied pre- or post-harvest under laboratory conditions and in orchard trials

et al. 2008

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The yeast Pichia anomala strain K was selected in Belgium from the apple surface for its antagonistic activity against post-harvest diseases of apples. The efficacy of this strain against P. expansum was evaluated in the laboratory in three scenarios designed to mimic practical conditions, with different periods of incubation between biological treatment, wounding of fruit surface, and pathogen inoculation. Higher protection levels and higher final yeast densities were obtained when the applied initial concentration was 1×10 8 cfu ml −1 than when it was only 1×10 5 cfu ml −1 . The protection level correlated positively with the yeast density determined in wounds and was influenced by apple surface wetness. In orchard trials spanning two successive years, biological treatment against P. expansum, based on a powder of P. anomala strain K (1×10 7 cfu ml −1 ), β-1,3-glucans (YGT 2 g l −1 ), and CaCl 2 .2H 2 0 (20 g l −1 ), was applied to apples pre-or post-harvest under practical conditions and its effect compared with standard chemical treatments. The first year, the highest reduction (95.2%) against blue decay was obtained by means of four successive fungicide treatments and the next-highest level (87.6%) with pre-harvest high-volume spraying of the threecomponent mixture 12 days before harvest. The second year, the best results were obtained with post-harvest Sumico (carbendazim 25% and diethofencarb 25%) treatment and post-harvest biological treatment, both by dipping the apples, 88.3 and 56.3% respectively. A density threshold of 1×10 4 cfu cm −2 of strain K on the apple surface seemed to be required just after harvest for high protective activity, whatever the method and time of application. In the case of pre-harvest biological treatments, variations in meteorological conditions between the 2 years may have considerably affected strain K population density and its efficacies.

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“…In the last few years, several reports have shown that co-inoculation of beneficial microorganisms could stimulate plant growth and/or increase plant disease resistance relative to inoculation with a single biocontrol agent (Raimam et al, 2007;Whipps, 2004). Although such combinations may enhance the level of plant protection against pathogen attack (Ezziyyani et al, 2007;Guetsky et al, 2001Guetsky et al, , 2002, the possible competitiveness between these micro-organisms has to be taken into consideration (Alabouvette et al, 2006). …”

Section: Interaction With Other Biocontrol Agentsmentioning

confidence: 99%

Pythium oligandrum: an example of opportunistic success

et al. 2012

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Pythium oligandrum, a non-pathogenic soil-inhabiting oomycete, colonizes the root ecosystem of many crop species. Whereas most members in the genus Pythium are plant pathogens, P. oligandrum distinguishes itself from the pathogenic species by its ability to protect plants from biotic stresses in addition to promoting plant growth. The success of P. oligandrum at controlling soilborne pathogens is partly associated with direct antagonism mediated by mycoparasitism and antimicrobial compounds. Interestingly, P. oligandrum has evolved with specific mechanisms to attack its prey even when these belong to closely related species. Of particular relevance is the question of how P. oligandrum distinguishes between self-and non-self cell wall degradation during the mycoparasitic process of pathogenic oomycete species. The ability of P. oligandrum to enter and colonize the root system before rapidly degenerating is one of the most striking features that differentiate it from all other known biocontrol fungal agents. In spite of this atypical behaviour, P. oligandrum sensitizes the plant to defend itself through the production of at least two types of microbe-associated molecular patterns, including oligandrin and cell wall protein fractions, which appear to be closely involved in the early events preceding activation of the jasmonic acid-and ethylene-dependent signalling pathways and subsequent localized and systemic induced resistance. The aim of this review is to highlight the expanding knowledge of the mechanisms by which P. oligandrum provides beneficial effects to plants and to explore the potential use of this oomycete or its metabolites as new disease management strategies.

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Combining Biocontrol Agents to Reduce the Variability of Biological Control

Cited by 256 publications

References 35 publications

Effects of Temperature and Relative Humidity on the in Vitro and in Vivo Radial Growth of Penicillium Italicum and on the Biocontrol Activity of Pichia Guilliermondii, Strain Z1

Effects of Temperature and Relative Humidity on the in Vitro and in Vivo Radial Growth of Penicillium Italicum and on the Biocontrol Activity of Pichia Guilliermondii, Strain Z1

Assessment of Pichia anomala (strain K) efficacy against blue mould of apples when applied pre- or post-harvest under laboratory conditions and in orchard trials

Pythium oligandrum: an example of opportunistic success

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