What is Downy Mildew?
Impatiens downy mildew is a foliar disease that is capable of complete plant devastation. Although sporadic back in 2004, today the disease seems wide spread and here to stay, at least for some years to come.
How does it spread?
Water splashing spores off an infected plant can spread the disease, but perhaps the most alarming method is the wind. Air currents can carry the infected spores for hundreds of miles, until they finally settle in a flowerbed somewhere. Which means if your plants are located in an area that receives wind your impatiens can get downy mildew. Plant these flowers with caution.
Light-green yellowing or stippling of leaves
Subtle gray markings on upper leave surface
Downward curling of infected leaves
White downy-like fungal growth on underside of leaves.
Leaf and flower drop resulting in bare, leafless stems
Infected stems become soft and plant collapse under cool, wet conditions.
Once a plant is infected it can not be saved. Remove any infected plants and discard to help prevent spreading.
Recommended alternatives that love the shade:
New Guinea Impatiens
Divine New Guinea Impatiens
These plants can be safely planted in a flowerbed that has shown evidence of the disease. All of which are in stock and ready for you at Bengert Greenhouse.
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