Abstract
Cowpea (Vigna unguiculata) crops stand out for their efficient adaptation to edaphoclimatic conditions. Insect pests, such as the leaf beetle Cerotoma arcuata, are among the main factors that limit cowpea yield. Chemical control methods are commonly used to control such pests; however, biological methods are an alternative to reduce the indiscriminate use of conventional pesticides. This study aimed to evaluate the effects of Beauveria bassiana inoculation on the growth and physiological parameters of the cowpea plant and assess the influence of the inoculation on the feeding performance and survival of C. arcuata adults. Colonization by B. bassiana was recorded in the stems (63.89%), roots (45.83%), and leaves (25%) of the cowpea plant. It was found that B. bassiana enhanced the plant height, number of leaves, and the dry mass of the inoculated cowpea plants as compared to the control. The treated plants exhibited higher net carbon dioxide (CO2) assimilation rates in the gas exchange evaluation as well as higher stomatal conductance, evapotranspiration rates, and chlorophyll (a + b) content than the control plants. Moreover, the Kaplan–Meier survival analysis showed that the B. bassiana negatively affected the survival of the insect in the leaf disc assays.
Data Availability
The data and materials used in the study are available on request from the authors.
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Acknowledgements
We want to express our sincere thanks to Dr. Manoel Mota dos Santos for providing the cowpea seeds.
Funding
This study was supported by the National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq, Grant 403708-2013-3) and was financed in part by the Coordination for the Improvement of Higher Education Personnel (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)), Brazil (Finance Code 001).
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All authors contributed to the conception and design of this study. Material preparation, data collection, and analysis were performed by JP, VLN, and DJS. JP wrote the first draft of the manuscript and all authors commented on the previous versions of the manuscript. All authors read and approved the final manuscript.
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This manuscript describes the experiments on the insect Cerotoma arcuata, a critical pest widespread in Latin America. Terrestrial invertebrates considered as agricultural pests, vectors of diseases, or biological control agents do not require any special authorization from the Brazilian Environmental Agency for Creation and Studies (INSTRUÇÃO NORMATIVA IBAMA No. 07, DE 30 DE ABRIL DE 2015). No other animal groups were used in this study.
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Pachoute, J., Nascimento, V.L. & de Souza, D.J. Beauveria bassiana Enhances the Growth of Cowpea Plants and Increases the Mortality of Cerotoma arcuata. Curr Microbiol 78, 3762–3769 (2021). https://doi.org/10.1007/s00284-021-02638-y
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DOI: https://doi.org/10.1007/s00284-021-02638-y