Metarhizium brunneum strain Cb15-III

Metarhizium brunneum strain Cb15-III is a biological insecticide based on an entomopathogenic fungus. It acts as a natural pathogen that specifically targets various insect pests by infecting them through direct contact.

The process of infection begins when the fungus spores adhere to the insect's cuticle. Utilizing a specific set of enzymes, the fungus breaks down the chitinous exoskeleton to penetrate the insect's body cavity.

Once inside, the fungus grows vegetatively, feeding on the insect's tissues and releasing toxins known as metarhizins. These toxins cause systemic failure and death of the host organism within a few days.

Following the host's death, the fungus emerges back to the surface to produce a new generation of spores. This biological cycle allows the fungus to persist in the soil and infect subsequent generations of pests.

The efficacy of this strain is highly dependent on environmental factors, particularly soil moisture and temperature, which are essential for the germination and colonization processes of the fungus.

This strain is specifically designed to manage soil-dwelling pests that damage the root systems of various agricultural crops. It is highly effective against larvae that spend a significant part of their life cycle in the soil.

The primary targets include larvae of scarab beetles, such as May beetles (white grubs), which are notoriously destructive to plant roots. It also shows excellent efficacy against wireworms and mole crickets.

In addition to root pests, the fungus is capable of infecting soil-dwelling stages of certain moth species, such as cutworms. This makes it a versatile tool for integrated pest management in different farming systems.

By utilizing this biological agent, farmers can significantly reduce pest populations while avoiding the accumulation of synthetic chemical residues in the environment or the final food product.

• Scarab beetle larvae (white grubs)
• Wireworms (click beetle larvae)
• Mole crickets
• Soil-dwelling cutworm stages

Application rates for the product are determined by the crop type, pest density, and specific soil conditions. It is typically applied as a soil drench or incorporated into the planting medium.

The best results are achieved when the product is placed directly into the root zone. This positioning ensures maximum contact between the fungus and the target pests as they navigate through the soil.

Optimal timing depends on the pest's life cycle, usually coinciding with periods when larvae are active near the surface. Applying the treatment in spring or autumn often yields the highest success rates.

Moisture is critical for the activation of the spores. Following application with irrigation or scheduling it just before rainfall helps the fungus establish itself within the soil profile more effectively.

On heavily infested sites, repeat applications may be beneficial. Over time, the fungus can become established in the soil, providing a level of natural suppression that increases with consecutive seasons of use.

A primary limitation for the use of this product is its incompatibility with synthetic chemical fungicides. Applying these chemicals can kill the fungus and render the biological treatment ineffective.

Temperature and moisture sensitivity also represent significant constraints. Extremely dry or high-temperature conditions can severely inhibit fungal activity and reduce the shelf-life of the spores in the field.

Exposure to direct UV sunlight should be avoided during application, as it can damage the fungal spores. For best results, the product should be incorporated into the soil shortly after application.

Proper storage is essential to maintain the product's viability. It should be kept in a cool, dark environment to prevent premature germination or loss of pathogenic activity prior to use.

While the product is generally safe for humans and non-target organisms, it is recommended to use standard personal protective equipment to prevent irritation from dust or concentrated solutions during preparation.