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Biocontrol Potential of Some Entomopathogenic Fungal Strains Against Bean Aphid Megoura japonica (Matsumura)

1
State Key Laboratory of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
2
Plant Protection Research Institute, Hanoi, Vietnam
*
Authors to whom correspondence should be addressed.
Agriculture 2020, 10(4), 114; https://doi.org/10.3390/agriculture10040114
Received: 4 February 2020 / Revised: 18 March 2020 / Accepted: 31 March 2020 / Published: 4 April 2020
This research reported the in vitro pathogenicity of Verticillium lecanii strains, L2 and L5, and Beauveria bassiana strains, B76 and B252, against Megoura japonica using leaf-dip method. The virulence potential of these four entomopathogenic fungal strains of V. lecanii and of B. bassiana were compared between fungi conidia (concentrations 1 × 106, 1 × 107, and 1 × 108 conidia mL−1) and culture filtrate. Moreover, binary combination of four different fungal strains (L2 + B76, B76 + L5, L2 + B252, and L2 + B76 + B252 + L5) were evaluated against M. japonica under control condition. Aphid mortality was recorded after two, four, six, and eight days of post-treatment. In the conidial concentration bioassay, strain B76 showed maximal mortality (85.3%) against bean aphid, and strain L5 showed the lowest effect (60.0%) at the highest concentration (1 × 108 conidia mL−1) at eight days post-treatment. Whereas, binary combinations of B76 and L2 strains showed the highest effect against M. japonica (90.5%) than other combinations. Moreover, in comparison with the effect of filtrate and conidia bioassay, 91.4% and 84.1% were achieved in strain B76, and the lowest effect (63.8% and 55.1%) was recorded in strain L5. View Full-Text
Keywords: Verticillium lecanii; Beauveria bassiana; Megoura japonica; binary combination; filtrates; conidial Verticillium lecanii; Beauveria bassiana; Megoura japonica; binary combination; filtrates; conidial
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Trinh, D.N.; Ha, T.K.L.; Qiu, D. Biocontrol Potential of Some Entomopathogenic Fungal Strains Against Bean Aphid Megoura japonica (Matsumura). Agriculture 2020, 10, 114.

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