What Are The Specific Temperature Requirements for Edible Mushroom Cultivation?

Edible fungi are poikilothermic fungi. The temperatures required for mycelial growth and fruiting body (mushroom) differentiation and fruiting are completely opposite. Temperature difference stimulation is key to fruiting. Ordinary air conditioners cannot precisely control the temperature in segments, which is the core reason why mushroom houses must have dedicated constant temperature and humidity units.

I. General Temperature Patterns for Three Stages of Growth (General Logic for All Edible Fungi)

1. Mycelial Cultivation Stage (Before the Bag is Fully Covered)

Core Requirements: High and constant temperature, without significant fluctuations. The mycelium is responsible for decomposing nutrients in the bag. Higher temperatures result in faster growth, but the upper limit cannot be exceeded, as high temperatures will burn the mycelium. The diurnal temperature difference should not exceed ±1℃; large temperature differences will lead to premature primordia formation, resulting in premature fruiting and deformed mushrooms.

Suitable Range: 22～26℃

Extremities: Below 18℃, growth stagnates; above 28℃, mycelium ages, turns yellow, burns, and easily breeds green mold and other miscellaneous fungi.

2. Fruiting Stage/Primary Differentiation (Most Critical, Requires Temperature Difference Stimulation)

After the mycelium has fully colonized the fruiting area, a temperature difference of 8-10℃ must be created to stimulate the mycelium to twist and form mushroom buds (primordia); a constant temperature environment will almost never produce fruiting bodies.

Daytime/Cultivation Temperature: 24℃; Nighttime: 14-16℃; continue for 3-5 days to complete fruiting induction.

Temperature fluctuations must not be sudden increases or decreases, otherwise the mushroom buds will wither and rot.

3. Fruiting and Harvesting Stage (Fruitbody Growth)

Core Requirements: Stable Low Temperature, Small Temperature Difference

The entire fruiting body development process must be carried out at a low temperature. Higher temperatures will result in: thin and long stems, small caps, easy opening of the cap, poor taste, and disease outbreaks;

Temperature control accuracy must be ±0.5℃; cold air must not blow directly onto the fruiting body.

General Suitable Temperature: 12-18℃

II. Temperature Standards for Mainstream Commercial Edible Fungi

1. Oyster Mushroom (Most Commonly Grown in Containers)

Mycelium: 23-25℃

Fruiting Induction: 8℃ Diurnal Temperature Difference, 15-18℃

Fruiting: 14-18℃; Above 20℃, rapid aging and rotting occur.

2. Shiitake Mushroom

Mycelium: 22-26℃

Fruiting Induction: Large Temperature Difference of Around 10℃

Fruiting: 12-16℃; Low Temperatures Produce Thicker Mushrooms and Better Appearance

3. Enoki Mushroom (Low-Temperature Special Variety)

Mycelium: 20-22℃

Fruiting Induction: 12-14℃

Fruiting: 8-12℃; Above 15℃, the stems are short and prone to lodging; Low-Temperature Units are Required

4. Button Mushroom (Industrialized Large Mushroom Houses)

Mycelium: 22-24℃

Casing Induction: 13-16℃

Fruiting: 14-17℃

5. King Oyster Mushroom

Mycelium: 22-25℃

Fruiting Induction: 14-17℃

Fruiting Stage: 12-16℃ (High temperatures can cause hollow fruiting)

III. Unique and Strict Temperature Requirements for Edible Fungi (Different from Common Fruit and Vegetable Cultivation)

* Strictly Prohibited During Mycelial Stage: While a diurnal temperature range of 5-8℃ is beneficial for the growth of common vegetables, a temperature difference greater than 3℃ during the mushroom mycelial stage will cause physiological disorders, premature differentiation of small mushrooms, competition for nutrients, and overall yield reduction. Specialized units maintain a constant temperature, with fluctuations ≤ ±0.5℃.

* Artificially Created Temperature Differences for Fruiting: Natural environments only allow for cultivation in spring and autumn. Containerized mushroom houses rely on air conditioning to automatically adjust the temperature, simulating temperature differences for multiple batches of production throughout the year. Ordinary air conditioners can only maintain a fixed temperature and cannot automatically switch between hot and cold to promote fruiting.

* Prohibition of Direct Low-Temperature Airflow During Fruiting Stage: After cooling, air should not directly wash over the mushroom buds. Low-temperature airflow will freeze the young mushrooms, causing spots and cracking. Specialized mushroom house air conditioners, equipped with uniform air ducts, provide gentle, diffused cooling without direct airflow.

* High temperature and high humidity combined greatly increase the risk of disease outbreaks.

Temperature > 20℃ + Humidity > 90% leads to large-scale outbreaks of green mold, mucor, and bacterial spot diseases. The unit features integrated temperature and humidity control, simultaneously adjusting dehumidification during high temperatures to cut off conditions conducive to disease development.

Dual protection against freezing at low temperatures and burning at high temperatures.

In winter, mycelium enters dormancy below 8℃; in summer, mycelium necrosis occurs above 28℃. The dedicated unit features a heat pump that automatically heats and maintains temperature in winter and continuously cools and controls temperature in summer, adapting to a wide range of environments.

IV. Consequences of Yield Reduction Due to Temperature Loss

High temperature of mycelium: burning of the mycelium, sourness in the bags, and doubling the time to full growth;

No temperature difference for fruiting: no fruiting, yield reduction of over 60%;

High fruiting temperature: long, thin stems, thin caps, easy opening of the cap, halving the commercial value;

Fluctuating temperature: withering of mushroom buds, rotting mushrooms, and spot diseases;

Direct cold air: cracked and deformed mushroom caps, unsellable.

V. Core Shortcomings of Ordinary Air Conditioners in Meeting Temperature Requirements: Poor temperature control accuracy, fluctuating by ±2～3℃, easily damaging mycelium; Can only provide cooling or heating, unable to automatically switch between the three stages of "high-temperature mycelium cultivation → cooling to promote fruiting → low-temperature fruiting"; High-speed cold air blows directly onto the mushrooms, causing deformities; Lacks temperature and humidity linkage logic, unable to control humidity simultaneously at high temperatures, leading to the growth of miscellaneous bacteria.