Identification and Control Methods for Non-pathogenic Diseases of Edible Fungi

II. Non-pathogenic diseases

Unsuitable living conditions, improper cultivation management measures, or genetic variation can all cause growth and development disorders and physiological disorders in edible fungi, producing

various abnormal phenomena. This kind of disease is not caused by pathogenic microorganisms or insect pests, so it is also called a non-infectious disease. The causes and symptoms are as follows:

(1)

Spindly overgrowth can occur in shiitake (Lentinula edodes), button mushroom (Agaricus bisporus), and oyster mushroom (Pleurotus ostreatus). Especially after the button mushroom beds are cased with soil, the fluffy mycelium grows vigorously, and "mycelium outpouring"

appears on the surface of the fine soil, forming spindly mycelial overgrowth; in severe cases it becomes dense and clumped, forming a mycelial film, which delays fruiting and reduces yield. In oyster mushroom, due to improper management, the mycelium

grows excessively, and a thick, sturdy network of mycelial strands forms on the surface layer of the substrate, without forming primordia of fruiting bodies, delaying fruiting. During the mycelial healing stage of shiitake substrate, if

management is improper, a relatively thick white mycelial film forms on the surface of the substrate, which does not change color and cannot form fruiting bodies.

Spindly mycelial overgrowth may be caused by improper management: insufficient ventilation in the mushroom house; in oyster mushroom and shiitake, the plastic film covering the substrate cannot

be aerated for a long time, so the carbon dioxide concentration becomes too high; in button mushroom, the fine soil casing and the surface of shiitake substrate blocks are too humid, and in oyster mushroom the substrate layer is dry, and these conditions

can all cause spindly mycelial overgrowth, which is unfavorable to the formation of fruiting bodies.