PanAmerican Seed announced a series of I. walleriana with resistance to Impatiens downy mildew. Beacon Impatiens, according to a press release, offer season-long performance and color to the shade without the disease risk. "... we are confident that our greenhouse customers, retailers and gardeners alike will have the confidence to grow garden Impatiens once more.” “With a plant structure, flowering time and flower size that is similar to existing Impatiens, ... There’s no special plant culture required for Beacon to be successful. Beacon Impatiens will have its debut at shows in 2019, with six core colors and two mixes in the series. A limited supply is available, with greater availability in 2020.
Syngenta Seed also has a release of resistant impatiens, the Imara TM series: https://www.syngentaflowers-us.com/campaign/imara-XDR-impatiens . Impatiens walleriana with a high degree of resistance to downy mildew.* Proven landscape performance with reliable ﬂowering all season long. Easy and economical, ideal for growing in packs and pots. ‘Welcome Back!’ to a favorite shade bedding plant.