Scientists at the University of Minnesota say they've discovered more than a dozen different types of a mold known as "plant destroyers."

At first, this rhodadendron plant just looks like it needs a little extra love. But through the microscope, you'll see something more destructive.

"It'll cause a wilting, or it'll kill the tree or plant outright," said Nick Rajtar, a researcher with the U's plant pathology program. "It's really species-specific, but basically mortality is the end goal for the pathogen, and it's really good at what it does."

It goes by the name phytophthora, a water mold that can kill trees, plants and crops.

Rajtar and his team found 22 different species in the state, 14 of which were previously undetected.

"Minnesota's nurseries ship a lot of material in from a

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