African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Virulence of entomopathogenic fungi against Plagiodera versicolora (Laicharting, 1781) (Coleoptera: Chrysomelidae)

Ismail Demir1, Seda Kocaçevik1, Emine Sönmez1, Zihni DemirbaÄŸ1 and Ali Sevim1,2*
1Department of Biology, Faculty of Science, Karadeniz Technical University, Trabzon, 61080 Turkey. 2Department of Biology, Faculty of Arts and Sciences, Rize University, Rize, 53100, Turkey.
Email: [email protected] or [email protected]

  •  Accepted: 21 May 2012
  •  Published: 16 May 2013

Abstract

The willow leaf beetle, Plagiodera versicolora (Laicharting, 1781), is one of the most destructive pests of manySalix and Populus species worldwide. A total of 12 entomopathogenic fungi including Beauveria bassiana(Bals.) Vuill., B. cf. bassianaMetarhizium anisopliae (Metch) Sorok, and Isaria fumosorosea (Wize) (formerlyPaecilomyces fumosoroseus) were tested against the larvae of this pest under laboratory conditions in order to find any possible fungal biocontrol agent against it. A conidial concentration of 1 × 107 conidia ml-1 for each isolate was applied to third instar larvae of the pest. Among tested fungal isolates, the highest mortality was obtained as 100% from B. bassiana KTU-57 within 14 days after inoculation (p < 0.05). This isolate also caused the highest mycosis value (83%) (p < 0.05). It was selected for dose-response test according to the screening test, and lethal concentration at 50% (LC50) value of the fungus on the larvae of the pest was calculated as 1.03 × 105 conidia ml-1 based on probit analysis. Consequently, B. bassiana KTU-57 appears to be a significant promising isolate against the willow leaf beetle as a possible biocontrol agent.

 

Key words: Plagiodera versicoloraBeauveria bassiana, lethal concentration at 50% (LC50), microbial control.