Description

Beauveria bassiana — Culture Summary

•       12cc liquid culture syringe containing viable Beauveria bassiana isolate

•       Entomopathogenic fungus — naturally parasitizes arthropod hosts

•       Intended for mycological research, laboratory study, and educational purposes

•       Grows on standard fungal culture media including potato dextrose agar and sabouraud dextrose

•       Produces characteristic white mycelium and conidiophores under laboratory conditions

•       Store refrigerated between 35–45°F; avoid freezing  

Beauveria bassiana Overview

Beauveria bassiana is a cosmopolitan entomopathogenic fungus found in soils worldwide, where it exists both as a facultative parasite of arthropods and as a saprophyte in organic matter. Originally described by Agostino Bassi in 1835 from silkworm infections in Italy, it was among the first fungal pathogens of insects to be scientifically characterized and is considered the type species of the genus Beauveria. The fungus exhibits a complex life cycle involving infection, colonization, and sporulation on arthropod hosts, followed by environmental persistence as free-living conidia and mycelium. Beauveria bassiana has been the subject of extensive research in entomopathology, biological control, and applied mycology since the late 19th century.

Beauveria bassiana Characteristics and Identification

Beauveria bassiana produces white to cream-colored mycelium in culture, transitioning to a powdery white conidial surface as sporulation proceeds. Conidiophores are densely clustered, giving infected hosts and mature cultures a characteristic chalky white appearance that earned the fungus the common name "white muscardine disease." Conidia are single-celled, hyaline, and broadly ellipsoidal to subglobose, measuring approximately 2.5–3.0 × 1.5–2.5 μm. On standard laboratory media such as potato dextrose agar, colonies are fast-growing, white, and develop concentric zonation patterns with radial furrows as they mature. Growth rate and morphology can vary between isolates and are influenced by temperature and nutrient availability.

Beauveria bassiana Habitat and Ecology

In nature, Beauveria bassiana occurs as a soil inhabitant and arthropod pathogen across diverse ecosystems from temperate to tropical regions. As an entomopathogen, it infects a wide range of arthropod hosts including insects, mites, and other arthropods through direct contact with conidia. Infection occurs when environmental conidia contact the host cuticle and germinate under appropriate humidity and temperature conditions. Following penetration of the exoskeleton, the fungus colonizes the host hemocoel, ultimately leading to host mortality. Post-mortem sporulation on the cadaver produces new conidia that persist in the environment and infect additional hosts. As a saprophyte, the fungus decomposes organic matter in soil and plant debris, contributing to nutrient cycling in terrestrial ecosystems.

Beauveria bassiana Laboratory Cultivation

Beauveria bassiana grows readily on standard mycological media under laboratory conditions. Potato dextrose agar, sabouraud dextrose agar, and malt extract agar all support reliable growth and sporulation. Optimal growth occurs at temperatures between 20–27°C, though the fungus tolerates a broader range from approximately 15–35°C. Humidity requirements are moderate during vegetative growth but high humidity promotes conidial production. The fungus is relatively tolerant of pH variation and grows across a range from approximately pH 4–8. Liquid cultures can be maintained in potato dextrose broth, sabouraud dextrose broth, or other standard liquid media with agitation to prevent mycelial aggregation. Spore production in liquid culture is typically lower than on solid media.

Beauveria bassiana Laboratory Parameters

Beauveria bassiana Research Applications

Beauveria bassiana serves as a model organism in entomopathology research, biological control studies, and applied mycology. Research applications include investigation of host-pathogen interactions, virulence mechanisms, environmental persistence, and strain variation. The species is extensively used in laboratory bioassays for evaluating entomopathogenic activity, dose-response relationships, and environmental factors affecting fungal efficacy. Molecular studies have examined genetic diversity within the species complex, leading to the recognition that "Beauveria bassiana" represents a species complex with multiple cryptic species. This culture is intended for research and educational use only and is not recommended for field application or pest management without appropriate expertise, regulatory approval, and safety protocols.

Beauveria bassiana Taxonomy

•       Kingdom: Fungi

•       Division: Ascomycota

•       Class: Sordariomycetes

•       Order: Hypocreales

•       Family: Cordycipitaceae

•       Genus: Beauveria

•       Species: Beauveria bassiana

•       Common Names: White Muscardine Fungus, Beauveria

Research Use Disclaimer

This culture is intended for research, educational, and laboratory study purposes only. Out-Grow makes no claims regarding biological control efficacy, field application suitability, or pest management outcomes. Users are responsible for compliance with local regulations governing the use of biological control agents and for implementing appropriate containment and safety protocols when working with entomopathogenic fungi.