White Spots on Cannabis Leaves? Know The Reasons

As a commercial cannabis grower, witnessing white spots on your precious cannabis leaves can be alarming. Not only do these unsightly spots affect the aesthetic appeal of your plants, but they could also indicate underlying issues that might compromise your crop’s health and yield. In this blog, we will delve into the possible causes of white spots on cannabis leaves and explore effective preventive measures to ensure a thriving cultivation environment.

Identifying the Culprit: Common Causes of White Spots

  1. a) Powdery Mildew: One of the most common reasons behind white spots on leaves is powdery mildew. This fungal disease thrives in warm and humid conditions, spreading rapidly and forming powdery, white patches on the leaf surface.
  2. b) Spider Mites: Infestations of spider mites can also lead to white spots on cannabis leaves. These tiny arachnids feed on plant sap, causing stippling and discoloration on the foliage.
  3. c) Nutrient Deficiencies: Certain nutrient deficiencies, such as calcium or magnesium, can manifest as white spots or discoloration on cannabis leaves, affecting overall plant health.

Prevention Is Key: Strategies to Mitigate White Spots

  1. a) Implement Strict Sanitation Practices: Maintain a clean and hygienic cultivation environment to minimize the risk of fungal and pest infestations. Regularly clean equipment, sanitize surfaces, and practice proper plant hygiene.
  2. b) Optimize Air Circulation: Enhance airflow within your grow room to reduce humidity levels and prevent powdery mildew development. Quality fans can help create an environment less conducive to fungal growth.
  3. c) Integrate Preventative Measures: Consider employing preventive treatments like neem oil or organic fungicides to combat powdery mildew and spider mites before they become problematic.
  4. d) Monitor Nutrient Levels: Regularly check nutrient levels in your growing medium and adjust feeding accordingly to avoid nutrient deficiencies that can lead to leaf issues.

white spots on cannabis leaves

AirROS Surface & Air Purification Systems: Your Ally Against White Spots

Consider investing in AirROS surface and air purification systems to bolster your preventive efforts. AirROS technology releases hydrogen peroxide, effectively targeting and eliminating pathogens, including powdery mildew spores, from the air and surfaces. The system adapts its sanitization power based on humidity levels, making it highly effective in high and low-humidity environments.

By incorporating AirROS, you can create a pathogen-free environment, significantly reducing the risk of powdery mildew. The result? Cleaner and healthier cannabis leaves enhance your crop’s overall quality and yield potential.

The presence of white spots on cannabis leaves can be disconcerting for commercial growers. However, with a clear understanding of the potential culprits and the implementation of preventive measures. You can protect your valuable crop and maintain a thriving cultivation environment. Considering the advanced technology of AirROS surface and air purification systems, you can fortify your defenses against pathogens, ensuring your cannabis leaves remain healthy, vibrant, and free from unsightly white spots.


Tel: +1 855-201-7243 | Email: marketing@sageindustrial.com