Q.impatiens
Have had great results planting in this area. Other plants in same area doing fine. Problem started at one end and progress to other. Took about a week.

Downtoearthdigs
Answered on June 1, 2019
It may take some further inspection on your plant and the growing area.
These articles will help you.
https://www.gardeningknowhow.com/ornamental/flowers/impatiens/impatiens-downy-mildew.htm
https://www.gardeningknowhow.com/ornamental/flowers/impatiens/impatiens-problems.htm
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