How To Get Rid Of Green Mold On Mycelium

How To Get Rid Of Green Mold On Mycelium. Reasons and Solutions

Do you really want to know how to get rid of green mold on mycelium? One of the most annoying things about growing mushrooms at home is green mold on Mycelium, also known as Aspergillus oryzae mold, which happens in any growing media such as straw, sawdust, coffee grounds, or rice husks.

Mold can be found almost anywhere; you may not realize it, but mold can develop on your Mycelium if it’s wet, especially if you have ventilation problems in your home, basement, or attic. This can cause your Mycelium to become discolored and may also cause dangerous toxins to form, which can harm your lungs and brain. How to get rid of green mold on Mycelium so that you can keep yourself and your family safe!

How to get rid of green mold on Mycelium.

Green mold is often considered a sign of an improper environment. It can also indicate that a colony is close by that should be wiped out before it propagates further and grows on your mycelium spawn or substrate.

The first step in getting rid of green mold on Mycelium is determining the cause, which might help stop it from happening again in the future and help keep mold spores from spreading through your home.

What can Cause green mold on Mycelium

How To Get Rid Of Green Mold On Mycelium

The most common cause of green mold on Mycelium is being too cold, but there are other causes that you need to be aware of as well. High humidity and debris accumulation can contribute to different types of fungi, such as aspergillus niger and penicillium species. Fungi are all around us.

They exist in the air we breathe, live on surfaces like carpets and rugs, and even grow on food! Suppose you have green mold on your Mycelium. In that case, it is essential to take care of it immediately because this mold releases toxic substances into the air and can lead to respiratory problems for humans.

1: The most common cause of green mold on Mycelium is being too cold

What is a cold shock? A cold shock occurs when you have been keeping your substrate and Mycelium at room temperature for too long and then place it in a cooler location (cooler than room temperature). What can Cause green mold on Mycelium? The sudden change in temperatures can start the process of freezing. All living organisms are sensitive to drastic environmental changes, which is why they need protection from the cold, heat, light, etcetera. 

When this happens with Mycelium, it can cause green mold because there’s no protection against the rapid freeze-thaw cycles accompanying an excellent temp drop. If left untreated, this problem will only worsen. In many cases, it may lead to total product loss if not remedied quickly enough!

How To Get Rid Of Green Mold On Mycelium
How To Get Rid Of Green Mold On Mycelium

2: A high level of humidity and debris accumulation

Green mold, also known as blushing or slime mold, is a type of filamentous fungus that prefers damp, dark spaces. It’s often found on poorly ventilated building materials and sewage in the wet areas of the house where humidity is present.

When green mold spores come into contact with organic materials such as wood and paper, they will secrete enzymes that can break down cellulose and release alcohols that are often toxic to humans. Other harmful chemicals these fungal colonies create include acids that degrade materials and ammonia, which is flammable.

3: Poor sterile workflow is another common cause

Poor sterile workflow is another common cause of mold contamination in mushroom farms. When harvesting mushrooms, not only do you need to wear sterile gloves, but you also need to scrub down anything that the mushrooms touched with ethanol and make sure the area is well-ventilated. Hence, there’s no buildup of condensation on your tray or table.

8 Ways How To Get Rid Of Green Mold On Mycelium.

This mold grows best in dark and damp places, with the humidity levels most conducive to its growth between 60% and 90%. The dehumidifier is the best option to remove moisture from the environment, but it doesn’t have as much reach as fans which circulate air more quickly. Fans will help force air out of any area being treated for mold so that new air replaces it- slowing down or preventing future mold growth at that spot.

1: Remove Mycelium

Removing Mycelium will be difficult, so work in small sections. Break up the Mycelium with a spoon or your hands and pull them away from the contaminated surface you want to be cleaned up. Scrap it off using a scraper or paint brush if it is stuck on something hard, like a countertop or shelf, since any remaining pieces may eventually start growing. 

You have to clean all surfaces thoroughly with soap and water before replacing the items. It is essential to prevent spores from contaminating new areas of your home by washing anything that came into contact with moldy surfaces in hot water (above 130 degrees Fahrenheit) for at least 20 minutes.

2: Use Fungicide 

Mold thrives on warm, moist surfaces and cannot grow without air or light. This makes it easy to spot if your fungus grows on a damp feeling with little airflow. The mold will usually appear green or white, with an often fuzzy texture that a musty odor could accompany.

The easiest way to eliminate the contamination from these areas is with fungicide, and we recommend you do so within 48 hours of spotting the mold for maximum effectiveness. 

Cleaners may work as well, but again for best results, use the cleaner and fungicide (in recommended concentrations) together when possible. Also, mold spores can enter your body through the skin, respiratory system, or gastrointestinal tract, so taking care of it quickly is essential!

3: Improve air circulation

Air circulation is critical when it comes to getting rid of green mold on Mycelium. The first step in this process is to make sure your home has a sufficient amount of air circulation. This will help your plants breathe better and help circulate air around the room the mushrooms are growing in, which increases the chances for mold growth! 

For example, you can open windows or doors for at least 5 minutes each day, with the goal of an additional five minutes per week until you have reached twenty-five-minute daily window/door opening sessions.

You can also try using an oscillating fan capable of exhausting 150 cubic feet per minute while sitting on top of a water bath – this should get things moving more than a simple desk fan would!

4: Dry out Mycelium

How To Get Rid Of Green Mold On Mycelium
How To Get Rid Of Green Mold On Mycelium

To prevent the growth of green mold, ensure you are providing your Mycelium with the proper conditions for optimum growth. This includes giving them some fresh air from time to time and ensuring that they don’t get too wet or too dry if you have any problems with green mold appearing on your Mycelium. 

5: Keep the area clean and airy

Be sure to maintain a clean and fresh environment for your mushroom mycelium by keeping the space open and well-ventilated, ensuring it has enough air flow and is exposed to light. If you see any greenish, moldy patches on the surface of your soil or potting mix (or inside them), this indicates a buildup of high levels of moisture in the substrate that must be reduced as soon as possible!

6: Avoid overwatering

Though mold will only grow in humid environments, overwatering your Mycelium can cause dampness and eventually lead to the formation of green mold. When watering, let the Mycelium dry slightly before watering again.

Overwatering leads to an imbalance in moisture which causes the fungus spores to germinate more quickly, so make sure you know when your plant is thirsty. If your plant is not wet after a few days, it probably needs water more often than once every 7-10 days!

7: Use Air Purifier

You can also use an air purifier or anti-bacterial sanitizer, as these will reduce the presence of mold in your house. Be sure that when you purchase a new air purifier, you buy one with proper filters, such as HEPA filters designed to reduce allergens, irritants, and many other particles from the air.

For the anti-bacterial sanitizer, make sure it’s made for your specific needs, such as one which is only for hardwood floors or bathroom counters, not both.

8: Check humidity level regularly

How To Get Rid Of Green Mold On Mycelium
How To Get Rid Of Green Mold On Mycelium

The critical factor for dealing with mold is maintaining a moderate humidity level in your home, being aware of when the humidity levels are high or low, and taking steps accordingly. 

Extremely high humidity can increase mold, while very low humidity can cause it to die off.

You can also check out our other related article Do Air Purifiers Give Off Radiation?

How to Spot Mold Contamination.

For your convenience, here is an explanation of what mold looks like and how you can detect it: 

  • Spots: These can be as small as a dust particle or as large as half an inch. All you need to do is take a picture of the spot and upload it to find out if it is green mold or not.  
  • Fuzzy Growth: Fuzzy growth usually means heavy contamination, and the area needs extra cleaning care. Look for fuzzy growth if you are concerned about a particular piece of furniture, bookcase, or cabinet. 
  • Bubbles: When looking for bubbles on mycelium sheets, ensure they are evenly distributed without any clusters. It’s better to have one isolated bubble than ten clustered together since this may indicate that it has been damaged by something else Powder-like Substance.
  • Look for powder-like substances on top of the mycelium sheets. If they’re light brown and smell sweetish or fruity, then they are most likely mildew spores that require treatment with bleach before growing again. 
  • Remove green or black spots (more commonly mold) by rubbing off the surface with a damp cloth and dry it well. Any spotty areas should be removed from the sheet because when green mold grows on dried patches, those patches become more challenging to remove. 
  • You will also want to check regularly for any signs of infestation. Your best bet is prevention because green molds produce allergens that affect respiratory systems once they start growing.

Here are the types of molds


People can get pretty freaked out when it comes to mold, but it’s nothing a little TLC and some antifungal products can’t fix. Unlike with leaks, you probably won’t be able to solve a green-mold situation without the help of a professional because mold is notorious for showing up in hard-to-reach places like behind your cabinetry or your plumbing pipes; on wood surfaces; and on concrete, stone, or tile (even if they’re impervious).

Does an air purifier reduce green mold?

How To Get Rid Of Green Mold On Mycelium
  • A green, fuzz-like mold can develop on your Mycelium, with certain kinds more likely than others to form these patches. It’s important not to confuse this with the brown, dried-out patches often seen on wooden surfaces such as cupboards or bookcases, typically dried foods or dust rather than a sign of disease or infestation. This green patch may indicate many problems in your room or office, such as high humidity and excess standing water that promotes the growth of microscopic organisms such as fungi. 
  • Frequent exposure of human skin to organic materials produces fatty acids and moisture from sweat which are essential for the growth of mycotoxins and may cause health problems ranging from fever and flu-like symptoms to eye irritation and difficulty breathing.


Get the answer to your questions.

How to deal with molds on Mycelium when growing mushrooms?

The spores of molds can easily be overlooked by the human eye when it settles on top of a mushroom cap with bald spots. Dealing with molds on Mycelium is more complex than dealing with brown molds, as the mold will continue to grow and overtake Mycelium even after being removed. Instead, one must bleach their mushroom caps until they are entirely white, then allow them to dry to ensure they are clean and safe to consume again.

How can I tell the difference between Penicillium and mushroom Mycelium?

You can tell the difference between Penicillium and mushroom Mycelium based on the colors you see on each one. Penicillium is white or cream-colored, but mushroom mycelium tends to be a light green or olive or has brown areas. Also, if you scrape away the mold with your fingernail, there will be a green fungus under it in mushroom mycelium, but not with Penicillium mold spores.

How do you get rid of cobweb mold?

Green mold is often caused by cobweb mold in your home, and it cannot be easy to spot unless you know what you’re looking for! If you notice your Mycelium turning green, it might be worth having a pest control company come out and inspect your home for cobweb mold. However, this will depend on how quickly the contamination became present. Cobweb mold can also grow on fabrics, carpeting, upholstery, furniture, or even ceilings, so inspecting these places can be helpful!


It is essential to make sure that you clean off any mold that is there and the type of fungi it could be. This happens because there is moisture in the mushroom, and when they are removed from the surface, they create humidity and can have residual water on them, which promotes mold growth. If you see any green or black molds, do not eat them. We suggest testing some samples before consuming a whole batch of product so that you can observe its effects on a smaller scale before ingesting it for good measure.

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