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Shiitake Mushroom Fruiting Stage Diseases: Symptoms, Causes & Control Solutions
2026-09-02
1. Physiological Disorders (Non-Pathogenic)
These common cultivation problems are triggered by unsuitable environments and improper operations, not bacterial or viral infections, directly damaging mushroom appearance and market value.
1.1 Lychee-like Primordia
Symptoms: Lychee-shaped conical primordia with undifferentiated cap and stipe, no commercial value.
Causes: Strain-temperature mismatch; low substrate C/N ratio (excessive nitrogen).
Solutions: Optimize substrate C/N ratio; follow strain temperature requirements; induce fruiting only after full mycelium maturation; remove abnormal primordia promptly.
1.2 Long-Stalked Mushrooms
Symptoms: Overlong stipes with tiny, underdeveloped caps.
Causes: High CO2, insufficient light, high temperature and overcrowded fruiting logs.
Solutions: Widen log spacing; improve ventilation and lighting; stabilize temperature and humidity.
1.3 Flattened Mushrooms
Symptoms: Flat, irregular, scale-free tan mushroom caps.
Causes: Premature fruiting; delayed bag removal causing extrusion deformation.
Solutions: Avoid early stimulation before suitable fruiting temperature; remove bags after 50%+ substrate color change; apply standard temperature shock treatment.
1.9 Fused Mushrooms
Symptoms: Clustered primordia grow with fused caps or stipes.
Causes: Excessive water and temperature stimulation before mycelium maturation.
Solutions: Avoid intense early-stage stimulation; thin out dense primordia in time.
1.5 Hollow & Soft Mushrooms
Symptoms: Soft, hollow stipes, small caps and dense fruiting clusters.
Causes: Aging or degraded spawn with weak mycelial vitality.
Solutions: Adopt high-vitality spawn; revitalize low-temperature preserved strains and subculture stably before use.
1.6 Fist-Shaped Mushrooms
Symptoms: Fist-like deformed mushrooms with curled caps and twisted stipes.
Causes: Uneven substrate density and over-deep inoculation holes.
Solutions: Keep uniform substrate packing; standardize inoculation hole depth and size.
1.7 Mushroom Bud Shriveling
Symptoms: Young buds turn yellow, shrivel and die in batches.
Causes: Hot-dry climate, improper high-temperature watering, overuse of pesticides and mechanical damage.
Solutions: Adjust cultivation schedule to avoid hot seasons; protect small buds and standardize watering and pesticide application.
1.8 In-Bag Mushrooms
Symptoms: Fruiting bodies grow inside bags, easily infected by Trichoderma and cause bag rot.
Causes: Excessive log turning, drastic temperature fluctuation and strong light during incubation.
Solutions: Limit log turning to 3-5 times; open bags and remove abnormal mushrooms completely once found.
2. Infectious Diseases (Pathogenic)
Caused by bacteria and viruses, these contagious diseases easily trigger large-scale rot and severe yield loss in commercial planting.
2.1 Brown Rot
Pathogen: Pseudomonas fluorescens
Damage: Outbreaks easily at 20°C in high-moisture substrate, spreading via water and tools. Infected mushrooms brown, rot and produce foul odors.
Control: Keep workshop sterile and disinfect tools regularly; remove diseased mushrooms timely; spray 72% streptomycin soluble powder to prevent re-infection.
2.2 Bacterial Blotch (Brown Spot)
Pathogen: Polymorphic tiny bacteria
Damage: Causes sunken brown spots, mushroom malformation and substrate slime with foul smell.
Control: Standardize sterilization and aseptic operation; remove diseased bodies; disinfect with 1000-fold diluted calcium hypochlorite solution.
2.3 Shiitake Viral Disease
Symptoms: Mycelial regression during growth; deformed fruiting bodies, premature cap opening, thin flesh and low yield.
Control: Use virus-free high-quality spawn; disinfect outbreak areas thoroughly; apply diluted Benomyl and Zineb solutions to block virus spread.
3. Key Takeaways
Most shiitake fruiting-stage losses result from non-standard management and delayed prevention. Stable environmental control, high-quality spawn selection, standardized operation and early disease treatment are core to high-yield, high-quality commercial cultivation.
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Henan Joconn Machinery Co., Ltd. is an enterprise specializing in the production of mushroom equipment. It is engaged in the development, production and application of machinery and equipment for mushroom growth production lines.