Don’t Forget About Downy Mildew on Impatiens

Jill Calabro, Ph.D. March 25 2020

Reports of impatiens downy mildew (IDM) have been surfacing, on common impatiens as well as one of the new IDM-resistant lines. It’s important to remember that the resistant lines are not immune and can still be susceptible if conditions are just right – namely cool, wet weather patterns and high disease pressure. Irrigation at night exacerbates the disease as well.

Scouting is critical this time of year for all impatiens growers; even the IDM resistant lines should be monitored. Symptoms start on leaves near the tips of branches. Yellow blotching is typical, as is ...

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