Question

Phytophthora infestans is an organism that causes the serious potato disease known as potato blight. The effect of Phytophthora infestans was most pronounced in Ireland in 1845-57. It killed most of the potato crop which caused over one million people to starve to death. What type of organism is Phytophthora infestans.

Answer 1

It is an oomycete.

These can often look like fungi, but they're not! They're actually more closely related to algae than fungi.