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Pathogenicity and other characteristics of the endophytic Beauveria bassiana strain (Bals.) (Hypocreales: Cordycipitaceae)
Ist Teil von
Egyptian journal of biological pest control, 2023-12, Vol.33 (1), p.79-8, Article 79
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2023
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
Background
Agriculture crops such as tomatoes and wheat are frequently targeted by insect pests which have a significant negative impact on the agricultural economies. The deployment of entomopathogenic fungi (EPF) for the control of the insect pests is an important alternative to synthetic insecticides. The EPF,
Beauveria bassiana
(Balsamo) Vuillemin, has been reported widely as a suitable biological control agent of many agricultural pests.
Results
In this study,
B. bassiana
SS-1 was isolated from local plant crops and its pathogenicity was assessed against the greater wax moth larvae
Galleria mellonella
(L.). The development of the pathogenic
B. bassiana
SS-1 on the insect was visualized using scanning electron microscopy (SEM). Results showed the ability of
B. bassiana
SS-1 to secrete extracellularly the important enzymes essential for insect cuticle penetration.
B. bassiana
SS1 recorded the maximum mean lipase (5.3 U/ml), protease (32.13 U/ml), and chitinase activities (2.95 U/ml). The endophytic pathogenic fungus
B. bassiana
SS-1 demonstrated pathogenicity against the fourth instar larvae of
G. mellonella
showing LC
50
at 2.47 × 10
2
conidia/ml and LC
95
at 3.98 × 10
5
conidia/ml. The SEM results showed physical contact with
B. bassiana
SS-1 hyphae on the surface of the
G. mellonella
larvae
.
Thus, the isolated EPF
B. bassiana
SS-1, even endophytic, could be a promising biocontrol agent to manage agricultural insect pests.
Conclusion
This study provided a comprehensive characterization of the pathogenicity of
B. bassiana
SS-1 with its microbiological characteristics. Future studies are needed to focus on the detection of highly virulent isolates against different insect pests and to assess their field contribution as a favorable biological control agent.