Entomopoxvirus

Definition

A genus of large, enveloped DNA viruses in the family Poxviridae that infect insects and other arthropods, distinguished from vertebrate poxviruses by their narrower host range, smaller genome size, and distinctive occlusion body formation in some subgenera. The genus comprises three subgenera (A, B, and C) classified by host range and virion morphology: subgenus A infects primarily beetles (Coleoptera), subgenus B infects butterflies and moths (Lepidoptera), and subgenus C infects flies (Diptera) and orthopterans. Unlike vertebrate poxviruses, many entomopoxviruses produce proteinaceous occlusion bodies that protect virions in the environment and facilitate horizontal transmission between hosts.

Etymology

From Greek entomon (insect) + poxvirus, reflecting the insect host range and structural affinity to poxviruses

Example

Diachasmimorpha entomopoxvirus, a member of subgenus C, has been investigated as a potential biocontrol agent against tephritid fruit flies, with field studies examining its transmission efficiency and host specificity in orchard ecosystems.

Synonyms

• EPV
• insect poxvirus

Related Terms

• Poxviridae
• baculovirus
• occlusion body
• Biological control
• invertebrate pathology
• nucleopolyhedrovirus
• Cytoplasmic polyhedrosis virus
• host specificity
• Virulence

Usage Notes

The term is used both as a genus name (capitalized, italicized in formal taxonomic contexts) and as a common noun for viruses in this group. Specialists distinguish entomopoxviruses from baculoviruses by their larger virion size, different cytopathology, and lack of the characteristic polyhedral occlusion bodies typical of nucleopolyhedroviruses. Subgenus classification (A, B, C) is preferred over older 'type' designations in current literature. Not all entomopoxviruses form occlusion bodies—this trait is absent in subgenus C, which complicates environmental persistence and formulation for biocontrol applications.