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    Root inoculation of strawberry with the entomopathogenic fungi Metarhizium robertsii and Beauveria bassiana reduces incidence of the twospotted spider mite and selected insect pests and plant diseases in the field


    Canassa, Fernanda and Esteca, Fernanda C.N. and de Andrade Moral, Rafael and Meyling, Nicolai V. and Klingen, Ingeborg and Delalibera, Italo (2020) Root inoculation of strawberry with the entomopathogenic fungi Metarhizium robertsii and Beauveria bassiana reduces incidence of the twospotted spider mite and selected insect pests and plant diseases in the field. Journal of Pest Science, 93. pp. 261-274. ISSN 1612-4758

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    Abstract

    The effect of inoculation of strawberry roots by two entomopathogenic fungal isolates, Metarhizium robertsii (ESALQ 1622) and Beauveria bassiana (ESALQ 3375), on naturally occurring arthropod pests and plant diseases was investigated in four commercial strawberry fields during two growing seasons in Brazil. Three locations represented open-field production while strawberries were grown in low tunnels at the fourth location. Population responses of predatory mites to the fungal treatments were also assessed. Plants inoculated by the fungal isolates resulted in significantly fewer Tetranychus urticae adults compared to control plants at all four locations. The mean cumulative numbers ± SE of T. urticae per leaflet were: M. robertsii (225.6 ± 59.32), B. bassiana (206.5 ± 51.48) and control (534.1 ± 115.55) at the three open-field locations, while at the location with tunnels numbers were: M. robertsii (79.7 ± 10.02), B. bassiana (107.7 ± 26.85) and control (207.4 ± 49.90). Plants treated with B. bassiana had 50% fewer leaves damaged by Coleoptera, while there were no effects on numbers of whiteflies and thrips. Further, lower proportions of leaflets with symptoms of the foliar plant pathogenic fungi Mycosphaerella fragariae and Pestalotia longisetula were observed in the M. robertsii (4.6% and 1.3%)- and B. bassiana (6.1% and 1.3%)-treated plots compared to control plots (9.8% and 3.7%). No effect was seen on numbers of naturally occurring predatory mites. Our results suggest that both isolates tested may be used as root inoculants of strawberries to protect against foliar pests, particularly spider mites, and also against foliar plant pathogenic fungi without harming naturally occurring and beneficial predatory mites.

    Item Type: Article
    Keywords: Endophytic entomopathogenic fungi; Microbial control; Plant–microbe interactions; Tetranychus urticae; Integrated pest management; IPM;
    Academic Unit: Faculty of Science and Engineering > Mathematics and Statistics
    Item ID: 14014
    Identification Number: https://doi.org/10.1007/s10340-019-01147-z
    Depositing User: Rafael de Andrade Moral
    Date Deposited: 15 Feb 2021 17:03
    Journal or Publication Title: Journal of Pest Science
    Publisher: Springer
    Refereed: Yes
    URI:

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