Inside the mycelia, there is black sclerotium, which causes part or all the floral receptacle brown or rotten.When the disc becomes rotten, seed cannot ripe or seed nut become rotten.

• 花盘受害时，花盘组织从底面到表面布满白色绒毛状菌丝层，内有黑色菌核，导致花托局部或全部变褐软化腐烂，俗称烂盘子病。