Sabbahi, Rachid; Merzouki, Abderrazzak et Guertin, Claude 
ORCID: https://orcid.org/0000-0002-0710-6970
(2008).
Efficacy of Beauveria bassiana (Bals.) Vuill. against the tarnished plant bug, Lygus lineolaris L., in strawberries
Journal of Applied Entomology
, vol. 132
, nº 2.
pp. 124-134.
DOI: 10.1111/j.1439-0418.2007.01226.x.
Résumé
Beauveria bassiana has a high insecticidal potential to control the tarnished plant bug, Lygus lineolaris, a significant pest of strawberries. Screening experiments showed that L. lineolaris adults were susceptible to several B. bassiana isolates. Another screening test with Coleomegilla maculata, a natural enemy found in strawberries, was also performed in order to select the isolate having lower entomopathogenic impact on this insect. Based on data obtained from both insect species and on the ecozone origin of the B. bassiana isolates, INRS-IP and INRS-CFL isolates were selected for further experiments. The LC50 values of these two isolates against L. lineolaris adults were 7.8 x 10(5) and 5.3 x 10(5) conidia/ml, and average survival time (AST) values were 4.46 and 4.37 days at a concentration of 1 x 10(8) conidia/ml respectively. Results also indicated that L. lineolaris nymphs are susceptible to the selected isolates. During field experiments, using a randomized block design with four replicates, INRS-IP and INRS-CFL isolates were applied at two rates (1 x 10(11) and 1 x 10(13) conidia/ha) weekly during a period of 4 weeks. These multiple applications triggered a significant reduction of L. lineolaris nymphal populations in strawberries. Twenty-four days after the first application, a significant difference was observed between the mean population densities of surviving nymphs in all B. bassiana-treated plots (less than one insect per five plants) compared with those in control plots (four insects per five plants). During the field experiment, persistence of insecticidal activity and viability of B. bassiana conidia were also monitored. The results showed the presence of viable and infective conidia up to 6 days after each application on strawberry foliage. Moreover, the multiple applications of B. bassiana at the rate of 1 x 10(13) conidia/ha triggered a significant reduction in strawberry fruit injuries induced by L. lineolaris feeding behaviour compared with the control plots.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | Beauveria bassiana; Lygus lineolaris; biological control; multiple applications; persistence of insecticide activity; strawberries; viability of conidia |
| Centre: | Centre INRS-Institut Armand Frappier |
| Date de dépôt: | 02 août 2024 13:51 |
| Dernière modification: | 02 août 2024 13:59 |
| URI: | https://espace.inrs.ca/id/eprint/15142 |
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