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Mushroom Disease Control Methods and Key Technical Points

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In late September, mushrooms begin to fruit successively, which is also the time when diseases in the mushroom house begin to multiply and cause damage. Mushroom walnut-flesh fungus (Diehliomyces microsporus) is one of the more serious diseases in mushroom production. This fungus is also called "false truffle," and its pathogen is Microsporon desmazieri. When the ascocarps cluster together, they appear walnut-flesh or cauliflower-shaped, pale yellow to cream-colored, turning light brown when mature. The surface is covered with a scaly, dandruff-like layer, and the flesh is dense and soft, giving off a fishy odor when crushed; the larger ones can reach over 10 cm. Once the mushroom bed is infected by walnut-flesh fungus, spraying on the bed surface should be stopped immediately

In late September, mushrooms begin to fruit successively, which is also the time when diseases in the mushroom house begin to multiply and cause damage. Mushroom walnut-flesh fungus (Diehliomyces microsporus) is one of the more serious diseases in mushroom production. This fungus is also called "false truffle," and its pathogen is Microsporon desmazieri. When the ascocarps cluster together, they appear walnut-flesh or cauliflower-shaped, pale yellow to cream-colored, turning light brown when mature. The surface is covered with a scaly, dandruff-like layer, and the flesh is dense and soft, giving off a fishy odor when crushed; the larger ones can reach over 10 cm.

Once the mushroom bed is infected by walnut-flesh fungus, spraying on the bed surface should be stopped immediately to dry out the substrate soil surface, and the fruiting bodies of the walnut-flesh fungus should be picked out and replaced with corresponding new soil. Wait until the room temperature drops below 16°C, then resume routine management, so as not to affect fruiting. In non-chemical artificial integrated management, pay close attention when the mushroom house temperature is high at 23-26°C: if ventilation is poor and the compost is overheated, acidic, and poorly aerated, the aerial mycelium weakens and massive outbreaks will occur; short, dense white mycelium appears in the compost, on the surface, or in the casing layer, a pungent bleaching powder odor arises in the compost, and while fruiting bodies form, large numbers of conidia are also produced.

Chemical control: If the infected area is small, diesel oil or kerosene can be poured on it, but it must not be used over a large area, so as not to affect fruiting. If a large area is seriously affected, environmental disinfection should be consistently carried out with 800-fold carbendazim solution, and mixing 800-fold carbendazim into the compost can prevent occurrence. Affected areas can also be treated with 2% formaldehyde, covered with plastic film for fumigation sterilization; using 10 kg of 1% limewater plus 25 g of sodium carbonate and spraying the affected area 1-2 times gives a relatively ideal effect.

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