Susceptibility of adult Phlyctinus (Coleoptera: Curculionidae) to entomopathogens: A first look at potential differences in a newly revised species complex

Hansen Steffan, Malan Antoinette P., Haran Julien, Addison Pia. 2024. Susceptibility of adult Phlyctinus (Coleoptera: Curculionidae) to entomopathogens: A first look at potential differences in a newly revised species complex. Journal of Applied Entomology, 148 (2) : 129-139.

https://doi.org/10.1111/jen.13214

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Url - jeu de données - Entrepôt autre : https://doi.org/10.17632/tckvm6hcwd.1 / Url - jeu de données - Entrepôt autre : https://doi.org/10.17632/fn2d8phjnm.1

Résumé : Phlyctinus callosus and P. xerophilus (Coleoptera: Curculionidae) are two cryptic species of native entimine weevils, previously grouped together under the P. callosus sensu lato concept, that are pests of economic importance to the deciduous fruit and vine industry in the Western Cape province of South Africa. Laboratory bioassays were conducted using entomopathogenic fungi (EPF) isolates of Beauveria and entomopathogenic nematodes (EPNs), Heterorhabditis indica and Steinernema yirgalemense, to determine differences in susceptibility of adult P. callosus and P. xerophilus to potential biological control agents. The test arena used was 24-well bioassay plates with an inoculation rate of 200 infective juveniles (IJs)/insect for EPNs and 5 × 105 conidia/insect for EPF. Insects were inoculated using a 12.7 mm filter paper impregnated with 50 μL of entomopathogen suspension. Infection was determined after 96 h incubation for EPNs through dissection of cadavers. Insects inoculated with EPF were incubated in the wells for 18 days and mortality recorded daily. Cadavers were surface sterilized and observed for overt mycosis. Differential susceptibility between P. callosus and P. xerophilus was observed in EPF but not in EPN bioassays. Differential susceptibility to EPF could be due to methodology. Low adult weevil pathogenicity was found for all entomopathogens, with variable results obtained from different bioassay batches.

Mots-clés Agrovoc : agent de lutte biologique, lutte biologique, Beauveria, gestion intégrée des ravageurs, champignon entomopathogène, lutte anti-insecte, Heterorhabditis, Steinernema, agroécosystème

Mots-clés géographiques Agrovoc : Afrique du Sud

Mots-clés libres : Biological control, EPF, EPN, Integrated pest management, Phlyctinus callosus, Phlyctinus xerophilus

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement hors UE : Hortgro Science, South African Table Grape Industry, National Research Foundation

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