Granulovirus

Granuloviruses are a group of entomopathogenic viruses belonging to the Baculoviridae family, used as selective biological agents for insect pest management.

The mode of action initiates when a susceptible larva ingests virus occlusion bodies while feeding on treated plant tissues or surfaces.

Inside the insect's midgut, the viral particles are released, infiltrating the epithelial cells and rapidly replicating throughout the host's body tissues and hemolymph.

The infection leads to the systematic collapse of the insect's internal organs, ultimately causing death within several days post-exposure.

This group of viruses is characterized by high target specificity, ensuring that beneficial insects, pollinators, and vertebrates remain unaffected by the treatment.

Granuloviruses are primarily deployed to control various species within the order Lepidoptera, which are significant pests of fruit, vegetable, and orchard crops.

They are widely recognized for their efficacy against the codling moth, a notorious pest that causes extensive damage to pome fruit production.

Other applications include the management of various leafrollers, cutworms, and other hidden-feeding larvae that are difficult to target with conventional contact chemicals.

These biological tools are essential components in sustainable agriculture, organic farming, and Integrated Pest Management (IPM) programs worldwide.

• Codling moth
• Grape berry moth
• Cabbage moth
• Cotton bollworm

Application rates are determined by the concentration of infectious occlusion bodies in the formulation, tailored to achieve optimal mortality in targeted pest populations.

Timing is crucial; applications must coincide with the peak of larvae hatching, as younger instars are significantly more susceptible to the viral infection.

High-quality coverage of foliage and fruit surfaces is necessary, as the virus acts through ingestion and lacks systemic transport properties within the plant.

Depending on pest pressure and field conditions, sequential treatments may be necessary every 7 to 14 days to protect newly developed plant tissues.

It is best to apply the product during late afternoon or evening hours to protect the virus from rapid degradation by ultraviolet sunlight.

A major limitation for granulovirus efficacy is their vulnerability to ultraviolet (UV) radiation, which can quickly degrade viral particles in open fields.

The products require specialized storage conditions, typically involving refrigeration to maintain long-term viral viability and bio-efficacy.

Unlike rapid-action chemical insecticides, granuloviruses exhibit a slower kill rate, requiring several days for the infection to result in pest mortality.

Mixing with alkaline substances should be avoided, as extreme pH changes can compromise the stability and integrity of the virus occlusion bodies.

Since the virus is stage-specific, targeting only larvae, accurate phenological monitoring of the pest population is required for successful intervention.