Insecticide resistance and fitness cost in Bemisia tabaci (Hemiptera: Aleyrodidae) invasive and resident species in la Réunion Island

Taquet Alizée, Delatte Hélène, Barrès Benoit, Simiand Christophe, Grondin Martial, Jourdan Hélène. 2020. Insecticide resistance and fitness cost in Bemisia tabaci (Hemiptera: Aleyrodidae) invasive and resident species in la Réunion Island. Pest Management Science, 76 (4) : 1235-1244. International Whitefly Symposium (IWS 2018). 3, Perth, Australie, 16 Septembre 2018/19 Septembre 2018.

https://doi.org/10.1002/ps.5633

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/10.5281/zenodo.4553738

Quartile : Q1, Sujet : AGRONOMY / Quartile : Q1, Sujet : ENTOMOLOGY

Résumé : BACKGROUND: Global and intensive use of insecticides has led to the emergence and rapid evolution of resistance in the major pest Bemisia tabaci (Gennadius). In La Réunion, an island of the South West Indian Ocean, three whitefly species coexist, two of which are predominant, the indigenous Indian Ocean (IO) and the invasive Middle East Asia Minor 1 (MEAM1) species. To assess the resistance level of both of these species to acetamiprid and pymetrozine, whitefly populations were sampled at 15 collection sites located all over the island in agroecosystems and natural areas, and tested using leaf‐dip bioassays. We also investigated the potential cost of resistance to acetamiprid by measuring six fitness‐related traits for MEAM1 populations that displayed different resistance levels. RESULTS: IO was mainly found in natural areas and was susceptible to both acetamiprid and pymetrozine. MEAM1 populations displayed evidence of high resistance to pymetrozine, whereas resistance to acetamiprid was more variable. No fitness‐related costs were associated with this resistance in MEAM1 populations. CONCLUSION: This is the first assessment of the susceptibility to insecticides for B. tabaci IO species. For the time being, no resistance to the tested insecticides has evolved in this species despite (i) its presence in agroecosystems and their surroundings, and (ii) its close proximity to, and possible hybridization with, the MEAM1 species. In contrast, with continuous selection pressure of insecticide treatments and in the absence of fitness cost to resistance, the invasive exotic species MEAM1 will continue to threaten agriculture in La Réunion. © 2019 Society of Chemical Industry.

Mots-clés Agrovoc : Bemisia tabaci, résistance aux insecticides, lutte antiravageur, santé des plantes, espèce envahissante, organisme indigène, insecticide, coût estimé

Mots-clés géographiques Agrovoc : La Réunion, France

Mots-clés libres : Arthropod, Chemical treatments, Toxicity, Field-evolved resistance, Pest management

Classification Agris : H10 - Ravageurs des plantes
H01 - Protection des végétaux - Considérations générales

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

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