Selecting thermal tolerant strains of entomopathogenic fungi to control Ceratitis capitata (Wiedeman) in tropical semi-arid conditions

Gava, C. A. T.; Leal, C. M.; Sá, Alicia Vieira de; Paranhos, B. A. J.

doi:10.1016/j.biocontrol.2022.105062

Cited by 3 publications

(2 citation statements)

References 54 publications

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“…Our model result shows that even at the most conservative parameter value of 40% coverage, a longer fungal decay time from 3-10 days will result in a 29.1%-66.4% reduction in the incidence of ECF infection in the cattle population compared to 11% for a decay time of 1 day. To date, techniques that have been explored for improving the persistence of EPF on treated surfaces include encapsulation of fungal conidia (Meirelles et al, 2023), incorporation of UV protectants in the formulation (Hedimbi et al, 2008), and use of thermotolerant strains of EPF (Gava et al, 2022). This may not only protect conidia from environmentally adverse conditions but also potentially increase the effectiveness of fungal formulations in natural field conditions.…”

Section: Product Properties Needed For Entomopathogenic Fungi To Achi...mentioning

confidence: 99%

Biological tick control: modeling the potential impact of entomopathogenic fungi on the transmission of East Coast fever in cattle

Oundo,

Hartemink,

de Jong

et al. 2024

Preprint

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Biological control of ticks using entomopathogenic fungi (EPF) is a highly desired alternative to chemical acaricides for the control of tick-borne pathogens. ForMetarhizium anisopliaeisolate ICIPE 7, one of these EPFs, efficacy against multiple tick species has been demonstrated in laboratory and field settings. However, we currently have little quantitative understanding of how EPFs can impact transmission. We developed a deterministic model of tick–host–pathogen interactions to explore how the effects of EPF onRhipicephalus appendiculatusticks may impact the transmission dynamics of East Coast fever (ECF) in cattle populations. We parameterized the multi-faceted effects of EPFs on tick dynamics using experimental data on Tickoff® biopesticide (a novel formulation ofM. anisopliaeICIPE 7) and related EPFs. The epidemiological impact of EPF was evaluated across a range of product profiles and implementation strategies. Model results indicate that, for the explored product profiles, EPF derives most of its epidemiological impact through the delayed mortality effect. This EPF-induced mortality could not only reduce the onwardTheileria parvatransmission to cattle (both treated and untreated) but could also cause a reduction in the tick-to-host ratio and thus cattle exposure to ticks. The effects of EPF on reproduction fitness and engorgement of ticks elicit negligible impact. High levels of population coverage and treatment frequency are needed to reduce the tick population size and reach meaningful epidemiological impact in cattle populations. Additionally, increasing the persistence time of fungal conidia on cattle skin – through technological improvements to the EPF formulation – can substantially reduce acute infections when combined with appreciable population coverage levels, treatment frequency, and efficient spraying techniques. Our model analysis provides insights into the potential impact of EPF when deployed at a population level, and lends support to further research and development of this biological tick control tool.

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Section: Product Properties Needed For Entomopathogenic Fungi To Achi...mentioning

confidence: 99%

Biological tick control: modeling the potential impact of entomopathogenic fungi on the transmission of East Coast fever in cattle

Oundo,

Hartemink,

de Jong

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Our model result shows that even at the most conservative parameter value of 40% coverage, a longer fungal decay time from 3-10 days will result in a 30%-66% reduction in the incidence of ECF infection in the cattle population compared to 11% for a decay time of 1 day. To date, techniques that have been explored for improving the persistence of EPF on treated surfaces include encapsulation of fungal conidia (Meirelles et al, 2023), incorporation of UV protectants in the formulation (Hedimbi et al, 2008), and use of thermotolerant strains of EPF (Gava et al, 2022). This may not only protect conidia from environmentally adverse conditions but also potentially increase the effectiveness of fungal formulations in natural field conditions.…”

Section: Mechanisms By Which Entomopathogenic Fungi Offer Indirect Pr...mentioning

confidence: 99%

Unraveling the epidemiology of tick-borne infections in cattle and the potential impact of a novel biopesticide in coastal Kenya

Oundo

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No interaction of fluctuating or constant temperature and virulence of entomopathogenic fungi in two noctuid species

2023

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The potential interaction of fluctuating temperature and the virulence of entomopathogens has implications for biological control. The objective of this study was to investigate the effect of entomopathogenic fungi (Metarhizium brunneum, Beauveria bassiana) on noctuid pest caterpillars (Spodoptera littoralis, Heliothis virescens) under constant and fluctuating temperature regimes. The results revealed similar virulence of entomopathogenic fungi under fluctuating temperature (20–30 °C or 15–35 °C) compared with constant temperature (25 °C). Experiments with cotton leaves as food confirmed that S. littoralis was less susceptible to entomopathogenic fungi (M. brunneum) than H. virescens. Results of additional experiments with H. virescens larvae, B. bassiana, and artificial diet were comparable to experiments with M. brunneum and cotton leaves, despite that susceptibility to B. bassiana was three orders of magnitude lower than to M. brunneum. The fact that both fungus species showed reduced growth on medium under fluctuating temperatures when compared to constant temperatures did not translate to an interaction of temperature regime and the virulence against noctuid larvae. Our study implies that virulence studies with noctuid larvae under constant temperatures using plant material or artificial diet might be fair models also for environments with fluctuating temperatures.

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Selecting thermal tolerant strains of entomopathogenic fungi to control Ceratitis capitata (Wiedeman) in tropical semi-arid conditions

Cited by 3 publications

References 54 publications

Biological tick control: modeling the potential impact of entomopathogenic fungi on the transmission of East Coast fever in cattle

Biological tick control: modeling the potential impact of entomopathogenic fungi on the transmission of East Coast fever in cattle

Unraveling the epidemiology of tick-borne infections in cattle and the potential impact of a novel biopesticide in coastal Kenya

No interaction of fluctuating or constant temperature and virulence of entomopathogenic fungi in two noctuid species

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