Botrytis in Cannabis Facilities: Causes, and Preventive Measures

Botrytis, commonly known as “bud rot” or “gray mold,” is a significant concern for cannabis cultivators. This pervasive fungal pathogen can devastate crops, leading to substantial financial losses and compromised product quality. Understanding the causes of Botrytis and implementing effective preventive measures are crucial steps in safeguarding your cannabis facility.

Causes of Botrytis in Cannabis

Botrytis cinerea, the fungus responsible for gray mold, thrives in specific environmental conditions. Recognizing these conditions can help in identifying and mitigating the risk factors associated with Botrytis outbreaks.

  1. High Humidity: Botrytis spores require moisture to germinate and spread. Environments with consistently high humidity levels create the perfect breeding ground for this fungus.
  2. Poor Air Circulation: Stagnant air allows moisture to accumulate on plant surfaces, providing ideal conditions for Botrytis growth. Poor ventilation can exacerbate the spread of spores throughout the facility.
  3. Temperature Fluctuations: While Botrytis can grow in a wide range of temperatures, rapid fluctuations between warm and cool conditions can stress plants, making them more susceptible to infection.
  4. Plant Density: Overcrowded plants limit airflow and create microclimates within the canopy that favor fungal growth. Dense foliage can trap moisture, promoting the development of gray mold.
  5. Infected Plant Material: Botrytis can be introduced into a grow room through contaminated seeds, clones, or tools. Infected plant material can quickly become a source of widespread infection.

Preventive Measures

Preventing Botrytis in cannabis facilities requires a proactive and integrated approach. By addressing the environmental conditions and implementing best practices, cultivators can significantly reduce the risk of Botrytis outbreaks.

  1. Maintain Optimal Humidity Levels: Keeping humidity levels between 40-60% during the flowering stage is crucial. Using dehumidifiers and monitoring humidity regularly can help maintain the ideal range.
  2. Ensure Adequate Airflow: Invest in a robust ventilation system that promotes continuous air movement. Oscillating fans and exhaust systems can help reduce stagnant air and prevent moisture buildup on plants.
  3. Monitor and Control Temperature: Maintain stable temperatures within the optimal range for cannabis growth. Avoid sudden fluctuations and ensure that your HVAC system is capable of managing the temperature effectively.
  4. Prune and Space Plants Properly: Regular pruning to remove excess foliage improves airflow within the canopy. Ensure that plants are adequately spaced to prevent overcrowding and reduce humidity pockets.
  5. Implement a Strict Sanitation Protocol: Clean and disinfect all tools, equipment, and surfaces regularly. Quarantine new plants and inspect them thoroughly for signs of infection before introducing them to your facility.
  6. Use AirROS Technology: AirROS by SAGE Industrial offers an advanced solution for preventing and controlling Botrytis. Utilizing reactive oxygen species (ROS), AirROS technology provides continuous, low-level sanitization of the air and surfaces within the grow room. This proactive approach helps eliminate fungal spores and reduces the need for chemical treatments.

Maximize Your Cannabis Yields with AirROS and Optimal Vapor Pressure Deficit (VPD) Management

Botrytis poses a significant threat to cannabis cultivation, but with careful management and the implementation of preventive measures, it can be effectively controlled. By maintaining optimal environmental conditions, ensuring proper plant care, and utilizing innovative technologies like AirROS, growers can protect their crops and ensure high-quality, mold-free cannabis.


Q1: What are the early signs of Botrytis in cannabis plants?

Early signs include small, water-soaked spots on leaves, which quickly develop into grayish, fuzzy mold. Buds may turn brown and become soft and mushy.

Q2: Can Botrytis affect the potency of cannabis?

Yes, Botrytis can compromise the quality and potency of cannabis by degrading the plant material and causing it to rot.

Q3: How does AirROS technology work in preventing Botrytis?

AirROS technology generates reactive oxygen species (ROS) that continuously sanitize the air and surfaces, effectively killing fungal spores and preventing their spread.

Q4: Is it possible to completely eliminate Botrytis from a grow room?

While it is challenging to completely eliminate Botrytis, maintaining optimal growing conditions and using preventive measures can significantly reduce the risk of infection.

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