Beauveria bassiana
Quick Facts
- Type
- Entomopathogenic fungus
- Source
- Naturally occurring soil fungus that infects insects through direct cuticle penetration
- OMRI Listed
- Yes ✓
- Bee Safe
- Yes
- Pet Safe
- Yes
- Residual
- Spores persist 7-10 days in shaded conditions; UV degrades rapidly
- Best For
- Whitefly and thrips programs in greenhouses or humid environments. Long-term biological suppression.
What Is Beauveria bassiana?
Fungal spores land on insect cuticle, germinate, and penetrate the exoskeleton using enzymatic action. The fungus colonizes the insect body cavity, consuming nutrients and producing toxic metabolites. Death occurs in 3-7 days. White fuzzy mycelium visible on dead insects.
Source: Naturally occurring soil fungus that infects insects through direct cuticle penetration
What Pests Does Beauveria bassiana Kill?
Beauveria bassiana is effective against the following pests:
How to Apply Beauveria bassiana
Best for: Whitefly and thrips programs in greenhouses or humid environments. Long-term biological suppression.
Avoid for: Dry, arid climates without irrigation. Emergency pest situations requiring fast knockdown.
Residual activity: Spores persist 7-10 days in shaded conditions; UV degrades rapidly
Safety Profile
| Category | Rating |
|---|---|
| Bee Safety | 🟢 Safe for bees |
| Pet Safety | 🟢 Safe for pets |
| Overall Rating | Safe — Safe for kids, pets, and bees when used as directed |
Why Isn't Beauveria bassiana Working?
If Beauveria bassiana isn't delivering results, check these common failure modes:
Low humidity — spores need >60% RH to germinate; dry conditions = failure
UV exposure — apply in evening; direct sun kills spores within hours
Slow action — takes 3-7 days; not a rescue treatment
Fungicide interference — chemical fungicides kill Beauveria too
Best Beauveria bassiana Products
BotaniGard ES
Emulsifiable suspensionProfessional greenhouse standard
Mycotrol ESO
OMRI sprayOrganic-certified Beauveria formulation
BioCeres WP
Wettable powderHome garden Beauveria option