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Powdery Mildew

Powdery Mildew

Have you ever noticed white patches like flour on leaves? If yes, this is called Powdery mildew. It is a fungal disease that is very common in the US, that first attack leaves and then spread over the whole plant. Species like roses, apple trees, cucurbits, strawberries, carnations, plum trees, tomatoes, and cannabis are victims.

Sphaerotheca macularis and leveillula taurica are the most hazardous cannabis powdery mildew strain. Even after a lot of precautions and care, pest attacks are expected. It is also easy to identify, but If it is not treated correctly, it covers the whole leaves, buds affecting its flavor negatively letting powdery mildew marijuana seeds be destroyed.

Causes of powdery mildew seeds strain:

  • High humidity levels above 55% can prove a breeding ground for fungi.
  • Less ventilation, less airflow further worsen it in the area where the plant is growing.
  • Overcrowding of plants in the area Spread of disease as leaves are touching other leaves, or Overlapping gives favorable scenarios to grow powdery mildew.
  • Excess nitrogen and imbalance in nutrition is another reason that makes plants powerless against attack.
  • To be defensive against fungi, deficiencies of silicon and calcium that are needed to strengthen should be treated. If not, they give rise to powdery mildew.

Signs that help to recognized Powdery mildew cannabis seeds:

  • Dusted with flour
  • Develop white patches which extend to the underneath, making it hard to eradicate, then destroy leaves, stem, and bud
  • The smell of bud turns bad leaves will then turn yellow and eventually brown, making plants die.

Leaving your plant with powdery mildew can be painful, and therefore specific steps help you successfully battle this disease.

How you can prevent:

1. Space: Make sure that there is ample space for marijuana plants to grow when you plant. Overflowing of plants makes them more susceptible, increased the chance of disease to spread rapidly.

2. Check temperature: Regularly and closely check your humidity level with proper airflow and ventilation. For this, a hygrometer, fan, ventilation system, and humidifier should be used.

3. Light: Allow your plant to absorb light while watering them. At least 5 hours of natural or artificial light is required to avoid pest outbreaks. If you're growing indoors, UVC light is the way.

4. Soil: Supply adequate water and provide good soil drainage.

5. Spray: Use copper-based fungicides or apply sulfur on a plant that is suspected to be infected.


To stop further growth of disease on an infected plant, use the following method:

  • Use neem oil foliar spray and PM wash, should be scheduled after seven days for the indoor marijuana plant.
  • Organic fertilizer, along with no abundant nitrogen and slow-release, enables birth chances of soft new leaves.
  • After harvest, removes all debris from the ground.
  • Home remedies such as milk spray, which should be made of 40% milk and water, can be an effective and easy technique.
  • After cleaning, a dense layer of mulch and organic compost should cover the soil, as it prevents spores from jumping back onto the leaves.
  • In sunny areas, use plant resistant cultivars, if possible.
  • Sterilized pruning tools after treatment

Above all treatment, you need to make sure to purchase good quality fast germinating seeds to reap benefits from its harvest and reduce risks of powdery mildew strain. In this regard, reach homegrown cannabis co. and enjoy purchasing seeds of your choice at affordable prices.

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