Plant Diseases
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In a humid canopy, disease moves faster than any spray schedule. Learn to spot common greenhouse diseases and exactly how to prevent plant diseases naturally with biofungicides.
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› Grower guide More information about Plant Diseases
In a warm, humid canopy, disease moves faster than any spray schedule. Learn to spot the common greenhouse diseases early and exactly how to prevent plant diseases naturally before they spread.
Powdery mildew, botrytis (gray mold), root rots, and damping-off can cut yield and quality in days. Because curative options are limited once disease is established, prevention — airflow, moisture management, and biofungicides — is everything.
How to identify common diseases
Powdery mildew shows as white powder on leaves; botrytis as fuzzy gray mold on stems and flowers; root rots as browning roots and wilting; damping-off as collapsed seedlings. Humidity, poor airflow, and overwatering drive most outbreaks.
Why diseases get out of hand
Pathogens thrive in warm, humid, crowded canopies and spread through water, air, and tools. Once they're established, you're reacting instead of preventing — which is why the winning approach is to defend the plant before the pathogen arrives.
How to prevent plant diseases naturally
Manage humidity and airflow, avoid leaf wetness and overwatering, sanitize tools, and apply biofungicides preventatively to colonize roots and leaves with beneficial microbes before pathogens can take hold.
Solutions that work
- CEASE (Bacillus subtilis) — preventative foliar biofungicide for mildews and botrytis.
- Asperello T34 (Trichoderma) — root-zone protection against damping-off and root rots.
Ready to protect your crop? Shop the full Plant Disease Products collection.
Frequently asked questions
How do I prevent plant diseases?
Control humidity and airflow, avoid leaf wetness and overwatering, sanitize, and apply biofungicides preventatively to build a protective microbial layer.
What are the most common greenhouse diseases?
Powdery mildew, botrytis (gray mold), root and crown rots, and seedling damping-off.
How do you treat powdery mildew naturally?
Improve airflow, reduce humidity, and apply biofungicides on a preventative schedule before the disease spreads.
Can I stop root rot without chemicals?
Yes — avoid overwatering, improve drainage, and colonize the root zone with a Trichoderma biofungicide.