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Impatiens Downy Mildew

PP309/PP309 by N. A. Peres and L. A. WarnerNovember 9, 2020Downy mildew on impatiens is of great concern throughout Florida. Winters in south Florida provide high humidity paired with cool nights, creating ideal conditions for disease development. Downy mildews are caused by several different species of pathogens that tend to be plant-host specific. Plasmopara obducens is the pathogen that affects impatiens. Some literature indicates that nighttime temperatures of about 50°F to 72°F favor downy mildew, but the disease has been reported on impatiens year-round in south Florida.

Impatiens x New Guinea Hybrids New Guinea Impatiens

FP281/FPS-281 by Edward F. Gilman, Teresa Howe, Ryan W. Klein, and Gail HansenNovember 6, 2023A UF/IFAS numbered Organism ID.

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