Sabbahi, Rachid; Merzouki, Abderrazzak et Guertin, Claude 
ORCID: https://orcid.org/0000-0002-0710-6970
(2008).
Efficacy of Beauveria bassiana against the strawberry pests, Lygus lineolaris, Anthonomus signatus and Otiorhynchus ovatus
Journal of Applied Entomology
, vol. 132
, nº 2.
pp. 151-160.
DOI: 10.1111/j.1439-0418.2007.01248.x.
Résumé
There are several insect species causing serious economic losses in strawberry, Fragaria vesca L., productions. In Quebec, Canada, the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), the strawberry bud weevil clipper, Anthonomus signatus (Say) and the strawberry root weevil, Otiorhynchus ovatus (L.) are the most important pests. We tested the susceptibility of these pests to the entomopathogenic fungus Beauveria bassiana under laboratory conditions. Sixteen isolates were evaluated for their insecticide potential against these insects. Adults of each species were infected by the immersion method. All isolates were pathogenic to adults of all three species, causing mortality rates between 23.3% and 100% at a concentration of 1 x 10(7) conidia/ml. Based on the screening results, isolate INRS-CFL was selected for its insecticide potential and then used for further analyses against L. lineolaris, A. signatus and O. ovatus adults. Bioassays were performed to evaluate the lethal concentration (LC50) and the average survival time (AST) of this isolate against both insect species. Results of dose-response mortality bioassays using four concentrations - 1 x 10(4), 1 x 10(6), 1 x 10(8) and 1 x 10(9) conidia/ml - indicated a LC50 values of 5.3 x 10(5), 1.8 x 10(7) and 9.9 x 10(7) conidia/ml at 7 days after inoculation for L. lineolaris, A. signatus and O. ovatus respectively. Using a dose of 1 x 10(8) conidia/ml, the AST values were estimated at 4.41, 7.56 and 8.29 days, respectively, at a concentration of 1 x 10(8) conidia/ml. This study demonstrated the potential of B. bassiana for the management of L. lineolaris, A. signatus and O. ovatus. Results also suggest that the heteropteran species is more susceptible than coleopteran species to B. bassiana.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | Beauveria bassiana; isolate screening; pathogenicity ;strawberry insect pests and biological control; virulence |
| Centre: | Centre INRS-Institut Armand Frappier |
| Date de dépôt: | 15 août 2024 04:17 |
| Dernière modification: | 15 août 2024 04:17 |
| URI: | https://espace.inrs.ca/id/eprint/15143 |
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