Variation in physiological host range in three strains of two species of the entomopathogenic fungus Beauveria

Rohrlich Clara, Merle Isabelle, Issa Mze Hassani, Verger Manon, Zuin Michel, Besse Samantha, Robene Isabelle, Nibouche Samuel, Costet Laurent. 2018. Variation in physiological host range in three strains of two species of the entomopathogenic fungus Beauveria. PloS One, 13 (7):e0199199, 15 p.

Url - jeu de données - Dataverse Cirad : https://doi.org/10.18167/DVN1/CBONRN

Quartile : Q2, Sujet : MULTIDISCIPLINARY SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Résumé : Knowledge of the host range of a biocontrol agent (BCA) is fundamental. Host range determines the BCA's economic potential, as well as the possible risk for non-target organisms. Entomopathogenic fungal strains belonging to the genus Beauveria are widely used as BCA, but our knowledge of their physiological host range is only partial. The aim of this study was to improve our understanding of the physiological host range of three Beauveria strains belonging to two species, B. hoplocheli and B. bassiana. We performed laboratory mortality bioassays to assess their pathogenicity and virulence against nine insect pests, belonging to three orders: Lepidoptera, Coleoptera and Diptera. Mortality rate, mean survival time and mycosis rate were used to estimate virulence. Pathogenicity was assessed as the capacity to cause a disease and induce mortality. Virulence was assessed as the severity of the disease based on mortality rate, mean survival time and mycosis rate. The results of this study revealed significant differences in the physiological host range of the three Beauveria strains tested. The three strains were pathogenic to all Diptera and Lepidoptera species tested. In the case of the Coleoptera, only the B. hoplocheli strain was pathogenic to the white grub Hoplochelus marginalis and only the B. bassiana strains were pathogenic to Alphitobius diaperinus. The B. hoplocheli strain was less virulent on Lepidoptera and Diptera than the two B. bassiana strains. The latter both exhibited very similar virulence patterns. The fact that B. hoplocheli and B. bassiana strains have different host ranges means that they can be used as BCA to target different pests. Impacts on non-target insects across multiple orders cannot be ruled out in the absence of ecological host range studies.

Mots-clés géographiques Agrovoc : La Réunion, France

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Agences de financement européennes : European Agricultural Fund for Rural Development

Auteurs et affiliations

• Rohrlich Clara, CIRAD-BIOS-UMR PVBMT (REU)
• Merle Isabelle
• Issa Mze Hassani, CIRAD-BIOS-UMR PVBMT (REU)
• Verger Manon
• Zuin Michel, Arysta LifeScience Group (REU)
• Besse Samantha, Arysta LifeScience Group (FRA)
• Robene Isabelle, CIRAD-BIOS-UMR PVBMT (REU)
• Nibouche Samuel, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0003-2675-1382
• Costet Laurent, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0003-3199-2885 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/588340/)

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