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Journal of Central European Agriculture, Vol. 24 No. 2, 2023.

Original scientific paper

https://doi.org/10.5513/JCEA01/24.2.3787

Effect of Beauveria bassiana (strain ATCC 74040) on two leaf beetle pests of maize under laboratory conditions

Dimitar I. VELCHEV ; Maize Research Institute, Agricultural Academy, 5835 Knezha, Bulgaria
Danail I. TAKOV ; Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel Blvd., 1000 Sofia, Bulgaria
Ivaylo A. TODOROV ; Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel Blvd., 1000 Sofia, Bulgaria
Daniela K. PILARSKA ; Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel Blvd., 1000 Sofia, Bulgaria
Teodora B. TOSHOVA orcid id orcid.org/0000-0001-8743-9216

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Abstract

In some European countries, the Western corn rootworm, Diabrotica virgifera virgifera, and the cereal leaf beetle, Oulema melanopus, are present in maize stands in high population density, occasionally causing damage of the crops. Susceptibility of adults of these species and larvae of the cereal leaf beetle to the commercially available product Naturalis® based on Beauveria bassiana strain ATCC 74040 was explored in laboratory conditions. The results of the bioassays showed that the fungal strain caused the highest corrected mortality on O. melanopus larvae with average values above 95% for all conidia concentrations (from 2.3 × 102 to 2.3 × 107 conidia/ml) tested. For the adults of the two pests, the average mortality increased positively with concentration of conidia and the values ranges from 9.5% to 94.2% for O. melanopus (concentrations from 2.3 × 102 to 2.3 × 107 conidia/ml) and from 19.3% to 92.4% for D. v. virgifera (concentrations from 2.3 × 103 to 2.3 × 107 conidia/ml). Accordingly, the LC50 values for O. melanopus larvae and adults and D. v. virgifera adults were determined as 4.6, 8.3 × 104 and 4.3 × 105 conidia/ml, respectively. Further studies to confirm the susceptibility of the larvae of the cereal leaf beetle to Naturalis® under field conditions should be conducted.

Keywords

Diabrotica virgifera virgifera; Oulema melanopus; mycoinsecticide; mortality; median lethal time; insect pest control

Hrčak ID:

305102

URI

https://hrcak.srce.hr/305102

Publication date:

30.6.2023.

Article data in other languages: bulgarian

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