The image appears to show leaf spots, which are commonly caused by fungal or bacterial infections such as Leaf Septoria or Bacterial Leaf Spot. Here’s how to treat it:

 

Steps for Treatment

1. Remove Affected Leaves

• Prune and dispose of infected leaves to prevent the disease from spreading. Do not compost them.

2. Improve Airflow

• Space out plants and trim dense foliage to improve airflow around the leaves.

3. Reduce Humidity

• Keep the growing area’s humidity between 40-60%. Use a dehumidifier if necessary.

4. Apply Fungicides (If Fungal)

• Use an organic fungicide like copper-based fungicide or neem oil. Spray in the early morning or late evening.

5. Apply Bactericides (If Bacterial)

• Use a copper-based bactericide. Follow the manufacturer’s instructions for dilution and application.

6. Water Properly

• Avoid overhead watering; water at the base of the plant to keep foliage dry.

7. Maintain Clean Growing Conditions

• Sterilize tools and keep the growing area free of plant debris.

8. Prevent Future Outbreaks

• Rotate crops and avoid replanting marijuana in the same infected soil. Use resistant strains when available.

 

Follow-Up

 

Monitor the plant regularly for new spots. If the infection persists, you may need to reapply treatment or consider stronger control measures.

 

If you suspect a specific pathogen (e.g., Leaf Septoria), let me know, and I can provide a more tailored approach!