TITLE

BIOLOGICAL CONTROL OF THE BLATELLA GEREMANICA WITH BEAUVERIA BASSIANA AND LECANICILLIUM MUSCARIUM

AUTHOR(S)
Khodaveisi, Sadegh; Davari, Behroz; Ala, Farzad; Javan, Khorosh; Abdolmalaki, Noshin
PUB. DATE
July 2013
SOURCE
Jundishapur Journal of Microbiology;2013 Special Edition, p39
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Introduction and Objectives: Lecanicillium muscarium and Beauveria bassiana grow naturally in soils throughout the world and acts as a parasite on various arthropod species, causing white muscardine disease; thus belongs to the entomopathogenic fungi. This study evaluates the entomopathogenic fungus L. lecanii and B. bassiana for effectiveness in controlling Blatella germanica. Materials and Methods: Conidial formulations of L. muscarium (PTCC 5184) and B. bassiana (PTCC5197) were prepared in aqueous suspensions with Tween 20. German cockroaches were immersed in a 5 ml oil-based conidial suspension at one of several aqueous conidial suspensions at 1×105, 106, 107 or 108 conidia ml or bait method. The control groups were immersed in water or oil solutions with no conidia. Treatments with aqueous conidial suspensions were conducted with 10 cockroaches per group (1×105, 106, 107, 108 conidia ml or control). Bioassays were repeated twice on different days with different batches of conidia. After treatment, the biological parameters were evaluated. Data were analyzed by Probit program and LC50 and LC90 concentrations were estimated. Results: The results indicate that all of the treatments significantly different from the control (P<0.01). Better results were observed when conidial B. bassiana suspension was used. By increasing the concentration suspension B. bassiana, mortality rate increases and LC50 and LC90 level were 1.5x107 and 6x108 spore/ml, respectively. Conclusion: The lethal concentrations (LC50 and LC90) observed with the aqueous conidial solution of L. muscarium and B. bassiana in this study are potential to control B. germanica, therefore, be seriously considered for the control of B. germanica. The entomopathogen can propound in biological control of the pest and supplementary studies must be continued, because factors responsible for host susceptibility are not known.
ACCESSION #
89588641

 

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