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• W3124557657 abstract "Abstract BACKGROUND Intensive application of chemical insecticides is required for aphid pest control. Among the biorational alternatives, entomopathogenic fungi are the most sustainable biocontrol agents; those of the order Hypocreales attack and cause fungal disease in arthropod hosts, with variations in host susceptibility attributed to both fungal and host characteristics. We evaluated inter‐ and intraspecies variations in Metarhizium spp. virulence and differences in fungal disease progression on adult and nymph stages of the green peach aphid, Myzus persicae (Sulzer), a parthenogenetically reproducing insect species. RESULTS Minor interspecies diversity was detected between the generalist Metarhizium species examined. Interestingly, significant intraspecies diversity was observed between Metarhizium brunneum isolates Mb7 and MbK. Infected adult aphids demonstrated similar disease progression for both isolates, mortality rates of more than 80% and fivefold reduction in fecundity. However, nymph mortality was detected only following MbK infection, with 50% mortality and significant reduction in molting rates. Confocal laser scanning microscopy demonstrated the variation in the disease stages of conidial adhesion and hemocoel colonization on each examined day post inoculation for each isolate. Significantly faster disease progression was observed in MbK‐infected versus Mb7‐infected nymphs, the latter demonstrating a higher percentage of uninfected nymphs accompanied with aphid molting. CONCLUSIONS The observed intraspecies variation suggests that altered conidial adhesion to the nymph cuticle is a major factor affecting virulence. We prove the role of nymph ecdysis as a defense mechanism disrupting fungal infection. Because significant differences were observed between closely related isolates, this study emphasizes the importance of appropriate isolate selection for biological control. © 2021 Society of Chemical Industry" @default.
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• W3124557657 date "2021-02-04" @default.
• W3124557657 modified "2023-10-18" @default.
• W3124557657 title "Intraspecies variation of <i>Metarhizium brunneum</i> against the green peach aphid, <scp><i>Myzus persicae</i></scp>, provides insight into the complexity of disease progression" @default.
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• W3124557657 doi "https://doi.org/10.1002/ps.6294" @default.
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