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The Most Common Causes of Powdery Mildew and How to Prevent It

Causes of Powdery Mildew

Causes of Powdery MildewPowdery mildew is the scourge of agricultural producers everywhere, and marijuana cultivators are no exception. Many growers mistakenly believe that mildew and mold thrive at higher temperatures. However, powdery mildew has an affinity for moderate temperatures in the typical range used for growing marijuana. This makes it a tough fungus to outsmart. Understanding the most common causes of powdery mildew can help you prevent it from taking over.

Most Common Causes of Powdery Mildew

Poor Air Circulation

Plants that are overcrowded are an excellent place for powdery mildew spores to develop. Keep plants evenly spaced and consider using an air ventilation system or fans to promote air circulation.

Insufficient Light

Plants need plenty of light to grow and produce buds. Insufficient light is one of the common causes of powdery mildew, and it can also lead to plants appearing weak or anemic. Ensure your grow light timers are set accurately to give plants the light they need. This also prevents water from pooling in soil, which can promote fungus development.


There is a tricky balance between providing plants with the nutrients they need and overdoing it. Powdery mildew preferentially attacks new plant growth. Giving plants too much fertilizer may cause them to grow too quickly, inviting a powdery mildew outbreak. Carefully monitor your delivery of nutrients to keep plants growing at a steady pace.

Compromised Air Quality

Although fans or ventilation systems are a good way to improve air circulation, they have a serious drawback: if powdery mildew develops, spores quickly spread throughout your entire cannabis crop. Compromised air quality can turn a mild powdery mildew outbreak into a catastrophic event. To prevent a disaster, invest in an air purification system such as AiroClean420, which neutralizes spores as they enter the reactor chamber of the purifier.

High Humidity

Powdery mildew thrives in humid environments. Using a hygrometer can help you monitor the humidity levels in your grow room. Seedlings require a higher humidity, close to 70%. As plants mature, however, you may drop humidity levels toward 40%. During the seedling phase, carefully monitor your plants for early signs of powdery mildew. They are particularly vulnerable during this time.
Although compromised air quality is one of the most common causes of powdery mildew, it is also among the easiest to correct. An air purification system such as AiroClean420 is the solution to your air quality problems. Contact the experts at AiroClean420 today to learn how this industry leading system can be fitted to your growing environment.

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