Impatiens’ easy-care nature, season-long bloom, and shade tolerance made it one of the most popular garden annuals.

Downy mildew of impatiens is a serious disease in the United States, caused by the fungus-like Oomycete, Plasmopara obducens. Originally found in Europe, impatiens downy mildew was detected in ...

Your description indicates that you have had downy mildew on your impatiens. Downy mildew of impatiens has been observed in the United States since about 1994 but became more widespread and ...

Georgia vegetable farmers should be on alert as downy mildew disease has been spotted in at least three southern Georgia counties this spring. Additional counties could follow as weather conditions ...

The study of basil downy mildew, caused by the oomycete Peronospora belbahrii, has evolved into a multidisciplinary field that integrates molecular biology, plant pathology and genetics. Research has ...

Mildews are the most common and most devastating diseases infecting cucumbers and other members of the cucurbit family of plants, which include squashes, pumpkins, zucchini and melons. There are two ...

Downy mildew, caused by a range of oomycete pathogens, remains a formidable challenge in agriculture, affecting numerous crops worldwide and resulting in significant yield losses. The pathogen’s ...

Impatiens used to be our favorite and best-selling annual flower. They bloomed like crazy, flowered reliably even in deep shade, and were cheap, too. Then a disease swooped in midway through the 2012 ...

October 2025 | Written by: Andrew Kness, M.Sc. Extension Research Assistant, Nathan Kleczewski, Ph.D. Extension Plant Pathologist, Kathryne Everts, Ph.D. Extension Vegetable Plant Pathologist Downy ...

Downy mildews are a group of fungal diseases that cause the destruction of the leaves, stems, flowers and fruits of many plant species worldwide. Downy mildew fungi are fairly host specific. This ...

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