Key to High-Yield Inoculation of Shiitake Mushrooms

Dense inoculation increases the number of spawn points on the log; more spawn points mean a larger colonisation area, allowing the mycelium to penetrate the log in a shorter time. The log exchanges gases with the outside mainly by absorbing and evaporating water; the alternating wet-and-dry movement of moisture allows sufficient oxygen to reach the interior of the log, enabling the mycelium to grow deep into the log and feed on it, thereby accelerating the maturation of the log and reducing the chance of infection by contaminating fungi.

With deep inoculation, deep spawn holes hold more spawn, which helps enhance drought resistance and reduces the temperature-difference stimulation from the outside on the spawn blocks at the bottom of the holes. Under relatively constant temperature and humidity, the mycelium inside the spawn blocks will germinate quickly, and the survival rate is improved. Making the holes deep increases the depth in the tangential direction of the wood, so that the mycelium absorbs more ample nutrients, and the yield will be greatly increased.

With early inoculation, under low-temperature conditions the density of contaminating fungal spores in the air is low and their activity is weak, so they do not easily germinate into mycelium, whereas shiitake mycelium can establish itself at lower temperatures, with strong resistance, robust mycelial growth and a high survival rate.