It is probably a fungal disease called “downy mildew” which has been causing problems since around 2012.
More on that HERE: https://www.canr.msu.edu/news/ask-the-expert-impatiens-downy-mildew
Peter Bowden Answered question
It is probably a fungal disease called “downy mildew” which has been causing problems since around 2012.
More on that HERE: https://www.canr.msu.edu/news/ask-the-expert-impatiens-downy-mildew