What are the causes of and control methods for excessive vegetative growth of shiitake mushroom mycelium?

Shiitake mushroom (Lentinula edodes) is an important edible mushroom species with strong edible and medicinal value. It is cultivated in all regions of China, but many growers encounter the phenomenon of excessive vegetative growth of mycelium during cultivation, which affects the formation of fruiting bodies. So what causes excessive vegetative growth of mycelium? How should it be controlled? Let's take a look at the detailed introduction from Qinnong.com.

1. Harm of excessive vegetative growth of mycelium

So-called excessive vegetative growth of mycelium means the mycelium grows too vigorously in the cultivation substrate. This situation does not only occur in shiitake mushrooms; it is a common physiological disease of many edible mushroom species. Excessive vegetative growth of mycelium consumes and wastes a large amount of nutrients in the culture material, resulting in an insufficient nutrient supply during fruiting, thereby affecting the formation of fruiting bodies. In addition, the mycelial skin is too thick, the respiration of the mycelium is inhibited, and the growth of fruiting bodies becomes difficult, leading to slow fruiting or no fruiting.

2. Causes of excessive vegetative growth of mycelium

There are many causes of excessive vegetative growth of mycelium, mostly related to problems with the growing environment and the cultivation substrate. If the shiitake cultivation room has too few windows or is built in a concealed environment, causing the room to be dark with little light, it may cause excessive vegetative growth of mycelium. When mixing the nutrient material, if too much water is added, or too much nutrient substance such as corn flour is added, it will also cause excessive vegetative growth of mycelium. High ventilation and air humidity in the indoor environment will also cause excessive vegetative growth of mycelium. When lifting the covering film too gently or lifting and moving the film for too short a time, and so on, all these causes will lead to excessive vegetative growth of mycelium.

3. Control methods for excessive vegetative growth of mycelium

During the mycelial growth stage and the fruiting stage, a good environment must be created to promote the formation and growth of fruiting bodies. When the mycelium begins to become thick and white and has grown to about 2 cm, the mycelium is mostly growing unevenly. At this time, lift the film open for one to several days for aeration until the surroundings of the cultivation bag are no longer sticky to the touch, then cover the film again.

On the second day, there is no need to lift or move the film; let the water vapor in the culture material cause the mycelium to lie down and change color. If it does not lie down, strengthen aeration and brush the mycelium with a tool to force it to lie down. Alternatively, spray very low-concentration lime water, let it dry, and then cover the film again, and it will change color and lie down.

The above are the causes of and control methods for excessive vegetative growth of shiitake mushroom mycelium brought to you by Qinnong.com. The content about excessive vegetative growth of shiitake mushroom mycelium is introduced here. To learn more agricultural knowledge, please stay tuned to Qinnong.com.