A common example of Oomycota is Phytophthora infestans. This is the organism responsible for the potato blight that caused the devastating Irish Potato Famine in the 19th century.

Here are some other examples of Oomycota:

* Saprolegnia: A genus of water molds that can infect fish, causing a disease known as "saprolegniasis."

* Pythium: A genus of soilborne plant pathogens that can cause root rot and damping-off in various crops.

* Peronospora: A genus of plant pathogens that causes downy mildew diseases in many crops, including grapes and lettuce.

Oomycota are often mistaken for fungi, but they are actually more closely related to diatoms and brown algae. They are an important group of organisms that play a significant role in both ecological and economic systems.