Granulovirus

Definition

A genus of rod-shaped, double-stranded DNA viruses in the family Baculoviridae that infect lepidopteran larvae and other arthropods, characterized by occlusion bodies containing single virions embedded in a protein matrix (granules) rather than the polyhedral occlusion bodies typical of nucleopolyhedroviruses. Granuloviruses are highly host-specific and have been developed as biological control agents against agricultural and forest pests.

Etymology

From Latin granulum (small grain) + virus, referring to the granular occlusion bodies visible under light microscopy.

Example

Cydia pomonella granulovirus (CpGV) is commercially formulated and applied to orchards to control codling moth larvae in apples and pears, with host-specificity so narrow that it does not affect beneficial insects.

Synonyms

• Betabaculovirus

Related Terms

• baculovirus
• nucleopolyhedrovirus
• occlusion body
• Biological control
• entomopathogenic virus
• Lepidoptera
• host specificity

Usage Notes

The genus was formally renamed Betabaculovirus in current ICTV taxonomy, though Granulovirus remains widely used in applied entomology and biocontrol literature. Granuloviruses produce smaller, more numerous occlusion bodies than nucleopolyhedroviruses, with typically one virion per granule versus many virions per polyhedron. The narrow host range makes them safer for integrated pest management than broad-spectrum insecticides, though this same specificity limits their commercial market.