, Volume 73, Issue 5, pp 545–551 | Cite as

A novel alphabaculovirus isolated from the cotton bollworm, Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae): characterization and pathogenicity

  • Gozde B. Eroglu
  • Ismail Demir
  • Zihni Demirbag
Original Article


The cotton bollworm, Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) is a polyphagous pest that exist all over the world. It is also very destructive in Turkey on various agricultural products. In this study, we have detected an alphabaculovirus from Helicoverpa armigera larvae collected from cotton field. The virus isolate was named as Helicoverpa armigera nucleopolyhedrovirus (HearNPV-O1) based on morphological and molecular properties. This is the first record of baculovirus from H. armigera in Eurasia region. Scanning electron microscopy examinations of polyhedral inclusion bodies (PIBs) showed their irregular morphology with average diameter of 0.85 to 1.25 μm. Transmission electron microscopy studies revealed that the nucleocapsids were multiple enveloped and bacilliform shaped. The size of nucleocapsid was found as 279 nm with a width of 56 nm. Digestion of viral genome by PstI generated 8 fragments with total size of 130.9 kbp. According to the phylogenetic analysis of the partial polyhedrin (polh), late expression factor 8 (lef8) and late expression factor 9 (lef9) genes, HearNPV-O1 isolate is very close to H. armigera MNPV Indian isolate-443. Five different concentrations of HearNPV-O1 between 103 and 107 were used in dose-response test on neonate, 3rd and 5th instars larvae of H. armigera. The highest dose (107) showed 92%, 88% and 57% mortality, respectively within 14 days. LC50 values of HearNPV-O1 isolate were calculated as 6 × 104, 7 × 104 and 8 × 106 PIBs/mL−1 against neonate, 3rd and 5th instars larval stages, respectively. These results demonstrate that HearNPV-O1 isolate may be a potential biocontrol agent to be utilized against H. armigera.


Alphabaculovirus Helicoverpa armigera Microbial control Insect viruses NPV 



We would like to thank to the Department of Metallurgical and Materials Engineering in Karadeniz Technical University for assistance with scanning electron microcopy studies.


This study was financially supported by Karadeniz Technical University (Project No: BAP06 FDK2016–5468).

Compliance with ethical standards

Conflict of interest

No potential conflict of interest was reported by the authors.


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Copyright information

© Institute of Molecular Biology, Slovak Academy of Sciences 2018

Authors and Affiliations

  1. 1.Department of Biology, Faculty of ScienceKaradeniz Technical UniversityTrabzonTurkey

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