powdery mildew

powdery-mildew的词性：
n.（名词）

1. Any of various fungi, especially of the family Erysiphaceae, that produce powdery conidia on the host surface.
白粉菌：一种能在寄主表面产生粉状分生孢子的真菌，尤指白粉菌科真菌

2. A plant disease caused by any of these fungi.
白粉病：由这些真菌中任何一种所引起的植物病