Above: Hosta with symptoms of leaf spots and necrosis. Do your landscape plants have cankers, mosaics, galls, mummies, or witches’ brooms? These and other symptoms are often hard for the average ...

Fungi are the most common causal agent of plant disease. Of the more than 2 million species of fungi worldwide, 8,000 are known to be detrimental to plants. These microscopic organisms cause symptoms ...

Aster yellows disease: You may have heard of this bizarre condition, or, like me, perhaps you’ve seen it in your own garden but didn't realize it was a disease. The first time I saw Aster yellows on ...

“The only time we saw crown rot symptoms thus far is by jabbing young plants with an inoculated toothpick,” Jackson-Ziems said. “Using that technique, several fusarium species could cause crown rot, ...