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Efficacy of Beauveria bassiana against the strawberry pests, Lygus lineolaris , Anthonomus signatus and Otiorhynchus ovatus
Author(s) -
Sabbahi R.,
Merzouki A.,
Guertin C.
Publication year - 2008
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.2007.01248.x
Subject(s) - lygus , beauveria bassiana , tarnished plant bug , biology , bassiana , fragaria , weevil , entomopathogenic fungus , horticulture , conidium , anthonomus , botany , biological pest control , miridae , curculionidae , heteroptera
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 × 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 (LC 50 ) and the average survival time (AST) of this isolate against both insect species. Results of dose–response mortality bioassays using four concentrations – 1 × 10 4 , 1 × 10 6 , 1 × 10 8 and 1 × 10 9 conidia/ml – indicated a LC 50 values of 5.3 × 10 5 , 1.8 × 10 7 and 9.9 × 10 7 conidia/ml at 7 days after inoculation for L. lineolaris, A. signatus and O. ovatus respectively. Using a dose of 1 × 10 8 conidia/ml, the AST values were estimated at 4.41, 7.56 and 8.29 days, respectively, at a concentration of 1 × 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 .