date:Sep 14, 2022
ta, this rust has been in the northeastern U.S. for 10 years or more. It was found in Wisconsin in 2021. Gymnosporangium yamadae is native to parts of Asia where it is a significant pest of apples and can result in defoliation of susceptible cultivars.
Discovering a new plant pathogen, like Japanese apple rust, is always a concern for our gardeners and farmers in Minnesota, said Mark Abrahamson, Director of MDAs Plant Protection Division. However, as weve observed on the East Coast where Japane