How To Get Rid Of Green Mold On Mycelium 2023

Mycelium is a vital component in the growth of mushrooms and plays a crucial role in the decomposition of organic matter. However, sometimes green mold can appear on mycelium, posing a threat to its health and overall growth. 

In this article, we will explore the causes of green mold on mycelium and discuss effective ways to eliminate it while ensuring the mycelium remains healthy and robust.

How To Get Rid Of Green Mold On Mycelium

Understanding Green Mold on Mycelium

Green mold, scientifically known as Trichoderma and Cobweb Mold, is a common fungal problem that can occur on mycelium, posing a threat to mushroom growers. 

Mycelium, the vegetative part of a fungus, plays a vital role in the growth and development of mushrooms. 

However, when green mold infects mycelium, it can hinder its growth, compromise the overall health of the mycelium, and even lead to contamination of entire mushroom crops.

What is Green Mold?

Green mold belongs to the Trichoderma genus and is characterized by its greenish appearance. It thrives in environments with high humidity and poor air circulation, making mushroom growing setups susceptible to its growth. 

The mold can develop quickly and spread rapidly, making it essential for growers to be vigilant in identifying and addressing the issue promptly.

Identifying Green Mold on Mycelium

Green mold on mycelium can be easily identified by its fuzzy, green or blue-green appearance. It often forms dense patches or tufts on the surface of the mycelium, leading to its distinct appearance. 

In contrast, healthy mycelium typically appears as a smooth, white or light-colored network.

Causes of Green Mold Growth on Mycelium

Several factors contribute to the growth of green mold on mycelium. Understanding these causes can help mushroom growers take proactive measures to prevent its occurrence. Here are some common reasons why green mold may develop on mycelium:

1. Poor Hygiene Practices

One of the primary causes of green mold growth on mycelium is poor hygiene in the growing area. Mushroom cultivation requires a clean and sanitized environment to minimize the risk of contamination. 

Failure to maintain cleanliness can introduce green mold spores and other contaminants, providing an ideal environment for their growth and multiplication.

2. Excessive Humidity

High humidity levels create a favorable environment for green mold to thrive. When the air is saturated with moisture, it encourages the development and spread of mold spores. 

Mycelium, which requires a moist environment to grow, can become more susceptible to green mold when humidity levels become excessive.

3. Lack of Ventilation

Inadequate airflow and ventilation in the growing area can trap moisture and create pockets of stagnant air. Such conditions provide an ideal breeding ground for mold spores to germinate and colonize the mycelium. 

Proper ventilation is crucial to maintain optimal humidity levels and inhibit the growth of green mold.

4. Contaminated Substrates and Equipment

The introduction of contaminated substrates or equipment into the growing environment can be another cause of green mold growth on mycelium. If any of the materials used in mushroom cultivation carry green mold spores, they can quickly spread and infect the mycelium.

5. Temperature Fluctuations

Extreme temperature fluctuations can weaken mycelium and make it more susceptible to mold infestations. Rapid changes in temperature can stress the mycelium, compromising its ability to defend against fungal attacks, including green mold.

Further Information: How To Clean Mold Off Grill?

How To Get Rid Of Green Mold On Mycelium

Now, we will discuss step-by-step procedures and necessary precautions to get rid of green mold on mycelium.

Use Fungicide Targeting Green Mold

Select a fungicide specifically designed to combat green mold on mycelium. Read the label carefully to ensure it is safe for use with your particular mycelium species and follow the application instructions precisely. Always wear protective gear when handling fungicides.

Remove Affected Mycelium

To prevent further spreading, carefully cut away any areas of mycelium visibly affected by green mold using a sharp knife. Dispose of the removed mycelium properly by sealing it in a plastic bag and discarding it away from any growing areas.

Improve Air Circulation

Green mold thrives in areas with poor air circulation. Enhance ventilation in the growing area to create an environment less favorable for mold growth. Use fans or open windows if growing indoors to ensure adequate air movement.

Allow Mycelium to Dry Between Watering

In warm and humid climates, green mold is more likely to flourish. Allow the mycelium to dry out between watering sessions to discourage mold growth. 

Find a balance between moisture levels that support healthy mycelium growth without providing excess moisture to the mold.

Sterilize Equipment

Ensure all equipment used with mycelium, including containers, tools, and substrate materials, is thoroughly sterilized. Boil the equipment in water for at least 10 minutes to eliminate any potential sources of contamination.

Practice Good Hygiene

Maintain good hygiene practices to prevent the spread of mold spores. Wash your hands thoroughly before and after handling mycelium and avoid touching your face or eyes during the process.

Keep a Clean Work Area

Regularly clean and disinfect your work area to minimize the risk of mold contamination. Wipe down surfaces with a suitable disinfectant solution, and keep the floor free from debris.

Use HEPA Filters

In indoor mycelium growing setups, utilize High-Efficiency Particulate Air (HEPA) filters to reduce the presence of mold spores in the air. This can significantly lower the chances of mold recontamination.

Avoid Overwatering

Overwatering the mycelium creates excess moisture, promoting green mold growth. Be cautious about the watering schedule and ensure proper drainage to prevent water from pooling around the mycelium.

Monitor Humidity Levels

Monitor humidity levels in the growing area and aim for around 60-70% relative humidity indoors to deter green mold growth. Adjust humidity levels as needed using humidifiers or dehumidifiers.

Proper Waste Disposal

Dispose of moldy mycelium properly to prevent further contamination. Seal mold-infested material in plastic bags before discarding it away from the growing area.

Be Cautious in Dusty Environments

Minimize the risk of introducing mold spores by being cautious when working in dusty or dirty environments. Keep the growing area as clean and dust-free as possible.

Choose Fungicides Carefully

When selecting fungicides, read labels thoroughly to ensure they are effective against green mold. Choose products that are safe for use with your specific mycelium species.

Promote Proper Air Circulation Indoors

When growing mycelium indoors, use fans or open windows to maintain proper air circulation. This helps to disperse mold spores and reduce their concentration.

Consider Natural Remedies or Biological Control

As an alternative to chemical fungicides, consider using natural remedies or biological control methods to combat green mold. Some options include neem oil, vinegar, or beneficial microorganisms.

Optimize Watering Timing

Water the mycelium during the daytime to allow excess moisture to evaporate, reducing the risk of mold growth overnight.

Keep Track of Humidity

Install a hygrometer in the grow room to continuously monitor and adjust humidity levels as needed to create an unfavorable environment for mold.

Educate Yourself on Mold Types

Educate yourself on different types of mold to distinguish green mold from harmless fungi. This will help you identify green mold promptly and take appropriate actions to eliminate it.

Kristen Park - Specialised Content Writer for Caresh Fresh


My name is Kristen Park and I am a senior writer specialising in how-to guides and home cleaning information at Cares Fresh. As a researcher, I take pride in digging deep to find every small detail on a topic and explaining it in a way that is easy for the reader to understand.