Wet Bubble
Mycogone perniciosa
Causes deformed, blob-like mushroom growth with amber/yellow liquid droplets. Undifferentiated tissue masses can grow as large as a grapefruit. The most important button mushroom disease in China.

Visual Identification
Deformed, blob-like mushroom growth — undifferentiated masses of tissue with amber/yellow liquid droplets on surface. Can grow as large as a grapefruit.
Treatable
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