Definitions

1. noun

A genus of fungi in the order Mucorales, commonly causing root rot in various plants.

“The gardener noticed a pythium infection in the tomato plant and sprayed it with fungicide.”

2. noun

A genus of fungi in the order Mucorales, commonly causing seedling blight in various plants.

“The seedling blight was caused by a pythium fungus, and it required immediate treatment.”