Hepa Filter for Growing Mushrooms: Things You May Want to Know

As a leading manufacturer of edible fungus growing equipment in the industry, Henan Joconn has always focused on providing high-quality equipment and excellent services to global customers. Our factory is located in an industrial park with a beautiful environment, covering a large area and well-planned.

There are many kinds of mushrooms, all of which have high nutritional value for us.

1.Raw Material Preparation
Mix raw materials according to the nutritional needs of the mushroom species (e.g., 78% sawdust, 20% bran, 1% gypsum, 1% lime). Use sawdust from broad-leaved trees (e.g., poplar, birch) and screen out large impurities. Bran must be fresh and free of mold, while corn cobs should be crushed into particles 1/4 to 1/3 the size of a corn kernel for uniform mixing. Use a spiral mixer to blend the materials for 15-20 minutes, ensuring even distribution and consistent nutrition to support mycelium growth.、

2.Bag Formation
Use a bagging machine to evenly fill polypropylene bags with the prepared mixture, adjusting weight and compactness as required (e.g., shiitake mushroom bags typically weigh 1.2-3 kg with moderate compactness). After filling, seal the bags with a binding machine to ensure a firm closure, preventing contamination. Machine binding is more efficient and reliable, making it a critical step in the production process.

3.Sterilization
Sterilization is crucial and requires strict control of temperature, pressure, and time:
Atmospheric Sterilization: Place the mushroom bags in a sterilization chamber, maintaining a temperature of 100°C for 10-12 hours using steam.
High-Pressure Sterilization: Sterilize under high temperature and pressure (121°C, 0.1-0.15 MPa) for 2-3 hours. This method is more effective but involves higher equipment costs. After sterilization, allow the bags to cool to a safe temperature before moving to the inoculation stage.

4.Inoculation
Inoculation must be performed in a sterile environment. Operators wear sterile clothing and use disinfected tools (e.g., inoculation needles, scoops) to evenly introduce the spawn into holes or onto the surface of the mushroom bags. The inoculation amount depends on the species and bag size (e.g., 10-15 g per bag for enoki mushrooms). The inoculation room is equipped with air filtration systems, UV lamps, and ozone generators to maintain sterility. Pass-through windows facilitate the transfer of materials while minimizing external contamination.

5.Cultivation
Place mushroom bags on multi-layer cultivation racks with adequate spacing for ventilation and observation. Adjust the environment based on the mushroom species:
Temperature: 22-26°C for shiitake, 20-25°C for king oyster mushrooms.
Humidity: Maintain at 60-70% using humidifiers or dehumidifiers.
Light: Oyster mushrooms thrive in diffused light, while enoki mushrooms grow better in darkness.
Ventilation: Ensure 1-2 air exchanges per hour to meet the oxygen needs of the mycelium.
Regularly inspect the growth conditions, and adjust ventilation or environmental parameters if excessive growth or abnormalities are detected, ensuring smooth cultivation progress.

1. Disaster Prevention and Mitigation Techniques
Preventive Measures (If your area has already been affected by a storm, skip this section):


Monitor weather updates closely and prepare essential supplies such as drinking water, food, medicines, and daily necessities to ensure personal and property safety.
Before the storm arrives, inspect and reinforce mushroom sheds, clear surrounding drainage ditches, and ensure smooth drainage to prevent flooding inside the sheds.
Safeguard materials such as spawn, raw materials, and cultivation bags by moving them to higher ground if necessary to avoid flood damage.
Factory-based mushroom enterprises and spawn production facilities should arrange for on-site personnel to ensure electrical and equipment safety, inspect power lines and transformers, and prepare emergency power supplies, water pumps, and backup lighting.
If the storm coincides with the outdoor fermentation of compost for button mushrooms, cover the compost with plastic sheeting before the rain and ensure proper drainage. Remove the plastic sheeting afterward to prevent anaerobic fermentation.
For high-temperature mushroom varieties, reinforce mushroom sheds and address drainage issues around the area
Ensure proper drainage to prevent mushroom cultivation bags from being soaked and contaminated.


2. Post-Disaster Response


Maintain Hygiene and Control Pests and Diseases

Clear weeds and debris around mushroom farms promptly, disinfect with lime or bleach powder, and manage pests like mushroom flies and contamination using specialized mushroom-safe pest control agents.



Clean Flood-Affected Areas

Drain standing water, remove mud and debris, and relocate submerged or buried cultivation bags to shaded, ventilated areas. Disinfect the premises with lime, chlorine dioxide, or bleach, ensuring thorough drying and pest control before resuming production.






Mushroom Bag Management

Wash submerged or contaminated cultivation bags with clean water, then spray with a lime or bleach solution. Relocate them to dry, ventilated areas for recovery.
For bags that absorbed excessive water, puncture small holes in the plastic to release moisture and improve aeration, promoting mycelial recovery. Conduct ventilation during cooler periods to avoid heat stress.
For severely damaged bags, reconnect broken sections with bamboo skewers, reposition them on racks, and remove any crushed or contaminated bags promptly to prevent cross-infection.



Reprocess Contaminated Spawn Bags

For spawn bags submerged shortly after inoculation, open the bags, sun-dry the substrate, and remix with fresh materials to recreate spawn bags.



Ensure Cultivation Environment Recovery

After cleaning and disinfecting, ensure soil or substrate conditions are restored to optimum levels for further cultivation.



By taking these preventive and responsive measures, mushroom farmers can minimize losses during extreme weather events and ensure the sustainability of their operations.

Piercing for ventilation during the mycelium development phase of shiitake mushrooms helps increase oxygen levels in the substrate, expel waste gases released by the growing mycelium, and accelerate its growth. This shortens the time needed for the mycelium to reach physiological maturity. Correct and reasonable piercing is one of the important measures to ensure high-quality, high-yield shiitake production in autumn and winter bag cultivation.

1. Characteristics of Oxygen DeficiencyMycelium growth slows down. The tips of the mycelium become thinner and uneven. Lumps or nodules may form. These symptoms indicate a lack of oxygen within the substrate bags, and piercing for ventilation becomes necessary.
2. Piercing MethodsFirst Piercing: When the mycelium circle has a diameter of about 10 cm: For bagged cultivation with sleeves, remove the sleeves. For bags without sleeves, pierce 4–6 holes around 2 cm inside the edge of the mycelium circle.
Second Piercing: When the bag is fully colonized by mycelium, typically 40–45 days after inoculation: Pierce on the side opposite the inoculation site. Keep the holes shallow, 1–1.5 cm deep, and create 20–30 holes per bag. This phase involves minor ventilation. Avoid large or deep holes or excessive hole numbers to prevent dehydration, which may hinder lump formation and primordia development.
Third Piercing: 7–10 days before removing the bags: This phase involves major ventilation. Holes should be 2 cm deep, with 40–60 holes distributed across the entire bag.

3. PrecautionsThe number and depth of holes affect oxygen levels, moisture content, and temperature within the substrate. Adjust these based on specific conditions of the substrate and environment. After piercing, reduce the stacking density per unit area. Arrange bags in a triangular (“△”) shape instead of a grid (“井”) to prevent excessive temperature rises, which could overheat and damage the mycelium.
4. Misconceptions About PiercingMany growers mistakenly believe that piercing should only occur after lumps or nodules appear on the substrate bag. However, the best time for piercing is 5–7 days after the mycelium fully colonizes the bag—before lumps form. Lumps usually result from a combination of high temperatures and oxygen deficiency. If lumps have already formed, the mycelium is already oxygen-starved. Piercing at this point can injure the mycelium, increasing the risk of "red water" leakage. To avoid such issues, pierce as soon as lumps begin to form or, ideally, beforehand.
5. Key Considerations for PiercingEnsure Full Mycelium Colonization: Piercing bags not fully colonized by mycelium increases the risk of contamination. Isolate uncolonized bags for separate management.
Prevent Cross-Contamination: Infected bags should be handled separately to avoid spreading contamination during piercing. A single infected bag can affect several others.
Temperature Management Post-Piercing: After piercing, the mycelium becomes more active and generates heat. Maintain temperatures around 25°C, and do not exceed 28°C to prevent overheating or damage to the substrate.

Effective management of temperature before and after piercing is critical to ensure substrate survival and success. Controlling temperature during this period is the key to achieving high survival rates. Once temperature is well-managed, success is within reach.