Natural occurrence of entomophthoroid fungi (Entomophthoromycota) of aphids (Hemiptera: Aphididae) on cereal crops in Argentina

Authors

  • R.G. Manfrino,

    Corresponding author
    1. Instituto Nacional de Tecnología Agropecuaria (INTA), Área Investigación Agronomía, Protección Vegetal, Ruta Nacional 34, Km. 227, Rafaela, Santa Fe, Argentina
    2. Centro de Estudios Parasitológicos y de Vectores (CEPAVE), UNLP-CONICET, Calle 2, nro 584, La Plata, Buenos Aires, Argentina
    • Correspondence

      R.G. Manfrino, Instituto Nacional de Tecnología Agropecuaria (INTA), Área Investigación Agronomía, Protección Vegetal, Ruta Nacional 34, Km. 227, Rafaela (2300), Santa Fe, Argentina. Email: manfrino.romina@inta.gob.ar

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  • J.L. Hatting,

    1. South African Agricultural Research Council, Small Grain Institute, Bethlehem, South Africa
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  • R. Humber,

    1. USDA-ARS Biological IPM Research, Robert W. Holley Center for Agriculture and Health, New York, NY, USA
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  • C.E. Salto,

    1. Instituto Nacional de Tecnología Agropecuaria (INTA), Área Investigación Agronomía, Protección Vegetal, Ruta Nacional 34, Km. 227, Rafaela, Santa Fe, Argentina
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  • C.C. Lopez Lastra

    1. Centro de Estudios Parasitológicos y de Vectores (CEPAVE), UNLP-CONICET, Calle 2, nro 584, La Plata, Buenos Aires, Argentina
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Abstract

The spectrum of entomophthoroid fungal species parasitising aphids on cereal crops and a study of the phenology and prevalence of these pathogens were investigated in Argentina. The studies were conducted at six different sites cultivated with crops of Triticum aestivum (wheat), Avena sativa (oats) and Sorghum bicolor (sorghum) during two consecutive years. Entomopathogenic fungi from the new phylum Entomophthoromycota were recorded from six aphid species on cereals in Argentina: Rhopalosiphum maidis, Rhopalosiphum padi, Rhopalosiphum rufiabdominalis, Schizaphis graminum, Sitobion avenae and Sipha maydis. Three species of entomophthoroid fungi were found infecting these aphid species: Pandora neoaphidis, Zoophthora radicans (Entomophthorales: Entomophthoraceae) and Neozygites fresenii (Neozygitales: Neozygitaceae). Entomophthoroid fungal infections occurred mostly in autumn–winter seasons (March–August), and coincided with periods of high relative humidity and comparatively low temperatures. This study represents the first base-line characterisation of entomophthoroid fungi infecting aphids on cereal crops in Argentina.

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